Topography data


2. This approach emphasizes accuracy, consistency and expeditious delivery of a quality product. NRCS is a member agency of the National Digital Elevation Program. Transport and Topography Data. LiDAR and Digital Elevation Data. In 1879, the USGS began to map the Nation's topography. Topographic LIDAR typically uses a near-infrared laser to map the land, while bathymetric Grid Extract: Select with Rectangle. A comparison between older data and newer high-resolution data shows remarkable improvement in A LIDAR instrument principally consists of a laser, a scanner, and a specialized GPS receiver.


Unlike the state map, the regional and local maps used all data available for the areas under study at the time of publication. These data include digital elevation model (DEM) layers computed from aerial lidar surveys and raster data from the Satellite Radar Topography Mission (SRTM) and other global datasets. Currently, the most recent version is published as “US Topo” and stored in digital format on the TNM Viewer. On September 23, 2014, the White House announced that the highest-resolution topographic data generated from NASA's Shuttle Radar Topography Mission (SRTM) in 2000 was to be released globally by late 2015. I am able to see the elevation profile in Google Earth when I move along the polyline but is there a way to extract the lat,long and elevation data out to Excel? Virginia Topographic Maps. Histograms of (A) topography, (B) heights with respect to an ellipsoid shifted by -2. The National Map - US Topo Program.


To download elevation data with The National Map Download Client: 1. The topography of B. Built from global and regional data sets, it is available in "Ice Surface" (top of Antarctic and Greenland ice sheets) and "Bedrock" (base of the ice sheets). The Indiana Spatial Data Portal (ISDP) archive provides the USGS digital topographic maps in two different products: the digital raster graphic (DRG) legacy product and the new US Topo product. Global: SRTM3 This data was collected during the Shuttle Radar Topography Mission (SRTM) and contains global coverage from 56 degrees south latitude to 60 degrees north latitude in 1 by 1 degree blocks with an approximate resolution of 90 by 90 meters. In this paper, we present a volumetric registration scheme that warps the Digimouse atlas [9] to an optically-imaged mouse based only on the atlas data and the measured surface topography of the imaged animal. To download, select your area of interest.


A. This data set is also available on the http MassGIS Data Layers On each page you will find metadata and links to free data download. 0 Global 1 arc second dataset (SRTMGL1), to include coverage over Asia and Australia. In support of military applications, the National Geospatial-Intelligence Agency (NGA) has developed standard digital datasets (Digital Terrain Elevation Data (DTED)) which is a uniform matrix of terrain elevation values which provides basic quantitative data for systems and applications that require terrain elevation, slope, and/or surface roughness information. Choose a Layer: 2. Does Tennessee have existing Displays USGS Topo Maps on Google Earth. View In: ArcGIS JavaScript ArcGIS Online Map Viewer ArcGIS Earth ArcMap ArcGIS Explorer View Footprint In: ArcGIS Online Map Viewer Service Description: USGS Topo is a tile cache base map service that combines the most current data in The National Map (TNM), and other public-domain data, into a multi-scale topographic reference map.


ON THE EXTRACTION OF CHANNEL NETWORKS FROM DIGITAL ELEVATION DATA DAVID G. A topo quadrangle map that has not been updated for 50 years will still have accurate elevation data, even though the indications of land use (especially boundaries of urban/suburban development) may be inaccurate. Rappaport, JPL. Topography is V19. An elevation surface can have more than one elevation source, and you can combine different types. Elevation data, or surfaces, are mostly used within 3D views to represent the ground, such as a terrain model. 2 foot contours.


This is also known as geomorphometry. C. Elevation Finder. In this colormap, the shades of green show the altitude The next Topographic and Bathymetric Data Inventory will be for the Southeast portion of the U. . In areas where valid bathymetry data are obtained, topography data should be collected under the appropriate time frame such that the resulting bathymetric and topographic data may be merged later with no discontinuity. But here’s a USGS Earth Explorer download guide to help you get started.


For the purposes of this article, topography specifically involves the recording of relief or terrain, the three-dimensional quality of the surface, and the identification of specific landforms. Elevation GIS and CAD data comes in many forms, formats, and from many sources. Elevation above the sea level The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U. edu or use the wiki and follow one of the dataset links if you want to update the information about a dataset that is already listed. (Credit: MOLA Science Team) Figure 5. Explore below to find the method that best suits your needs. This is a tiled collection of the 3D Elevation Program (3DEP) and is one meter resolution.


is used to create maps of the provincial landbase. Map Service Name: World_Topo_Map Description: This map is designed to be used as a basemap by GIS professionals and as a reference map by anyone. Geoscience Australia develops and maintains topographic maps and data for a variety of applications. Raster For the datasets listed below, pre-computed raster data are available from OpenTopography. Close this Window Free Digital Elevation Model (DEM) and Free Satellite Data Download Links NASA Shuttle Radar Topography Mission (SRTM) V3 Global 1 arc second hillshade image of the Mt Everest region. , from Florida to Maryland. The announcement was made at the United Nations Heads of State Climate Summit in New York High quality digital elevation data will support the Agency business activities by improving employee effectiveness and efficiency in providing assistance to our customers through the use of digital elevation models (DEM), hillshade, slope, and contour map and data products.


- View a listing of available high resolution topography datasets within OpenTopography along with detailed metadata information. Select an Area from the map Warning: these data not "The NED serves as the elevation layer of The National Map, and provides basic elevation information for earth science studies and mapping applications in the United States. This dataset offers a unique opportunity to analyze topography both before and after the September 2013 seismic event. FREE topographic maps online 24/7. Airplanes and helicopters are the most commonly used platforms for acquiring LIDAR data over broad areas. Go to www. Natural hazards may or may not be depicted on the data and maps, and land users should exercise due caution.


Latitude range is +/- 80. Department of the Interior | U. You can create an image of the topography using the elevation data and a custom colormap. Free Topographic Map (DRG) and GIS Data Sources for all 50 US States This is a list of online sources for Digital Topographic Maps. The most accurate and useful elevation data for locations in North Carolina are LIDAR-based products discussed in the se We show you 2 quick ways to download USGS Topo Maps. DATA – Download GIS data for Indiana. Want to add your dataset to this list? Please complete this data form first.


S. These data are intended for geographic display and analysis at the national level, and for large regional areas. Since 1985, we’ve continuously provided superior GIS and drafting support by streamlining our methods and evolving our approach. The name comes from Greek βαθύς (bathus), "deep", and μέτρον (metron), "measure". 1:250 000 is a smaller scale than 1:100 000), the fewer features are depicted in the data and naturally they will be less spatially accurate. The legacy DRG's are available in TIFF format (with or without the map border) and GeoPDF® format. DEM data collections are now being developed based on data with a contour resolution of 2 feet to 6 inches.


Enhanced Elevation Technical Specifications; LiDAR FAQ. Office of the Chief Technology Officer (OCTO) and participating D. To date, offerings span data conversion, design, and technology implementation in GIS mapping. Extract topography or gravity data from global 1-minute grids in ASCII XYZ-format. The black lines correspond to zero-elevation contours. Data themes Large-scale, digital topographic maps are most common; many data resources contain elevation information acquired in the 1920s and 1930s. Even when not used directly in a study, topographic data are often used in preparing visualization tools such as perspective or stereoscopic views of terrain.


You can have surfaces that do not represent the ground, such as the ozone layer, which is above the ground surface, or geological substrates, which are below the ground surface. 7 Mw earthquake. BRAS, AND IGNACIO RODRIGUEZ-ITURBEt Ralph M. In modern mechanized farming, large, relatively level fields allow for lower operating costs. This dataset contains locations and attributes of 2-ft interval topography data, created as part of the DC Geographic Information System (DC GIS) for the D. The Shuttle Radar Topography Mission (SRTM) (Wikipedia article) is a NASA mission conducted in 2000 to obtain elevation data for most of the world. How to Download Free USGS Topo Maps with the National Map Viewer.


This interface attempts to ease the pain of downloading 30-meter resolution elevation data from the Shuttle Radar Topography Mission. It provides an introduction to using the API and reference material on the available parameters. The spherical harmonic gravity model and digital gravity map products were generated by William L. Konopliv, JPL. The announcement was made at the United Nations Heads of State Climate Summit in New York Global Elevation Datasets. IndianaMap Layer Gallery; Indiana Map Metadata (HTML,TXT,XML) IndianaMap Open Topography (Indiana LiDAR data ) . 1 and Gravity is V27.


Topographic data are information about the elevation of the surface of the Earth. Click on yellow tiles to download their corresponding data. Bathymetry is the study of underwater depth of lake or ocean floors. What data is available for Australia? National coverage is available at 1 second (~30m), 3 second (~90m) and 9 second (~250m) resolution. TNRIS archives, maintains, and distributes the largest collection of current and historical geographic data sets for the State of Texas. 1. We have many ways for you to explore and access our data.


Topographical plans and maps are drawings which show the main physical features on the ground, such as buildings, fences, roads, rivers, lakes and forests, as well as the changes in elevation between land forms such as valleys and hills (called vertical relief). Select desired options. MapData Services – Australia and New Zealand’s leading mapping data specialists – offer authoritative street, transport and topography data sets, sourced from a range of premier suppliers. The 2018-2019 state budget provides funding for FDEM to undertake a statewide LiDAR project. Feel free to contact us CSDMSweb@colorado. USGS Elevation Data Global: SRTM3 This data was collected during the Shuttle Radar Topography Mission (SRTM) and contains global coverage from 56 degrees south latitude to 60 degrees north latitude in 1 by 1 degree blocks with an approximate resolution of 90 by 90 meters. While not yet a complete archive of all LiDAR data acquired in the state, the collection is growing, especially with new 3DEP projects being completed each year.


Select with Coordinates. In other words, bathymetry is the underwater equivalent to hypsometry or topography. Shading indicates changes in slope or elevation. ETOPO1 is a 1 arc-minute global relief model of Earth's surface that integrates land topography and ocean bathymetry. Data Set Producer. The relief shading in this topographic map comes mostly from elevation data collected by space-based radars. If you're interested in images and visualizations created from SRTM data, go to the Image Product Description page.


Using the 1:24,000 scale topographic maps produced by the US Geological Survey, we can identify the individual summits in Virginia. The Land Processes Distributed Active Archive Center (LP DAAC) recently released additional tiles in the NASA SRTM Version 3. For USA only. , -2001m) are constrained by actual soundings while even values (e. Before ordering ASTER GDEM data, users must agree to redistribute data products only to individuals within their organizations or projects of intended use, or in response to disasters in support of the GEO Disaster Theme. ncl This script draws a topographic map from the same 2' data as the previous example, except it zooms in on Australia and New Zealand. The date below the datalayer name on each page represents the month and year of the most recent update (or when the data first appeared in MassGIS' database).


com for DEM and satellite image articles and free software. There are numerous elevation datasets with global or nearly global coverage, but by far the most significant is SRTM. This technology is used to measure distance and derive highly accurate elevation data. A modern topography printout can be quite daunting for the beginner because of the volumes of data it contains. This page contains links to both internal (WAGDA) and external webpages dealing with data which generally covers all of Washington State. Step 1. and its territories.


TopoView highlights one of the USGS's most important and useful products, the topographic map. 0 Introduction The SRTM data sets result from a collaborative effort by the National Aeronautics and Space Administration (NASA) and the National Geospatial-Intelligence Agency (NGA - previously known as the National Imagery and Mapping Agency, or NIMA), as well as the participation of Using the 1:24,000 scale topographic maps produced by the US Geological Survey, we can identify the individual summits in Virginia. com for PANCROMA Satellite Image Processing software, data, White Papers and videos. Note that odd values of topography (e. The map includes administrative boundaries, cities, water features, physiographic features, parks, landmarks, highways, roads, railways, and airports overlaid on land cover and shaded relief imagery for added context. This method is only suitable if you have access to Civil 3D, Recap (or Project Momento), and obviously Revit! You can start with a range of U. The Topography Dataset is available for purchase.


Sjogren, JPL and Alex S. The smaller the scale (i. Digital elevation model (DEM) data are available using The National Map Download Client, or through bulk data delivery. The Shuttle Radar Topography Mission, which flew aboard NASA's Space Shuttle Endeavour during an 11-day mission in 2000, made the first near-global topographical map of Earth, collecting data on nearly 80 percent of Earth's land surfaces. Topography in a narrow sense involves the recording of relief or terrain, the three-dimensional quality of the surface, and the identification of specific landforms. Topography data descriptions. Our mission is to make it easily accessible and available to the public.


Depending on your needs, you can choose “US Topo” or “Historical Topographic Maps” in the TNM Viewer. Since 2010, the USGS has been developing digital, image-based topographic maps for the entire country. The data provided are: DEM (digital elevation model), 2-ft elevation contours, spot elevations, breaklines, and masspoints, all in both NAVD88 and NGVD29 vertical datums. Geospatial resolution imagery with high accuracy of the data, zoom capabilities and the distance with topo data between 2 or more geographic locations. This is an automatically generated table. The data should be displayed and analyzed at scales appropriate for 1:7,500,000-scale data. USGS MapView – USGS Geologic Maps of the entire US.


View Data as Image. The Elevation API developer guide is intended for website and mobile developers who want to use elevation data within maps provided by one of the Google Maps Platform APIs. Two types of LIDAR are topographic and bathymetric. Geological Survey server, and not indirectly through other sources which may have changed the data in some way. The Global Multi-Resolution Topography (GMRT) synthesis is a multi-resolutional compilation of edited multibeam sonar data collected by scientists and institutions worldwide, that is reviewed, processed and gridded by the MGDS Team and merged into a single continuously updated compilation of global elevation data. , -2000m) are predicted from gravity. " We show you 2 quick ways to download USGS Topo Maps.


Two such data types are commonly used with GeoPads. e. 2018 Statewide LiDAR Project. A stepwise approach is very handy in interpretation. (For more information on datums, please visit the National Geodetic Survey's ASTER Global DEM (GDEM) data are subject to redistribution and citation policies. Get the topographical and geographic information of any area. In modern usage, this involves generation of elevation data in digital form .


In the western states, the topo map includes township and range markings, which can be helpful when trying to sort out questions in the BLM data. 738. World Topographic Map. You base these plans and maps on Bathymetric Data Viewer Topography is the sum difference between the low areas and the high areas of a landscape and all the land forms in between. This is a major shift from the rather simplistic videokeratographs and keratometers. Along with the paper-based Topo50 map series, digital images of the maps are also publicly available. The first are data that represent the information typically found on a topographic quadrangle map, such as contour lines, roads, streams, railroads, towns, etc.


Under the Data category, check the box next to ‘Elevation Products The “USGS Topo Base Map” service named “USGS Topo” has been refreshed with new data and design changes. Tests included 16 wind directions to provide measurement of the wind directional vectoring and Client libraries make developing with the Google Maps web service APIs easier by providing simple, native implementations of common tasks, such as authentication, request throttling and automatic retry. 5-minute quadrangle maps, and are hosted by CUGIR. We achieve this registra-tion in three stages: After the map was assembled by hand, local and regional bedrock topography maps, published since Horberg (1957), were incorporated into this bedrock topography map. LAS datasets and terrain datasets cannot be used as an elevation source. g. Data or information provided by the CGS shall be used and relied upon only at the user’s sole risk, and the user agrees to indemnify and hold harmless the CGS, its officials, officers and employees from any liability arising out of the use of the data/information provided.


Topography—that is, the surface of the soil and its relation to other areas—influences efficiency of operation. The data are dynamic and may change over time. Light Detection and Ranging (LiDAR) elevation data is an optical remote sensing technology that can measure the distance to, or other properties of a target by illuminating the target with light often using pulses from a laser. In addition, several of the “Data Availability”, or “Data Index” services have new cloud hosted URLs. No responsibility is assumed by the National Atlas of the United States in the use of these data. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. When the checkbox next to the dataset name is checked, more options appropriate for each dataset are displayed under "Product Search Filter".


More recently, LIDAR has been collected over much of the State in many Use the Projects in Map View panel to zoom to datasets by clicking or touching them. "RasterFill" is used in place of "MeshFill" for comparison. Set the CDataMapping of the image to 'scaled' to linearly scale the data values to the range of the colormap. government agencies. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. We are cooperating with other state and federal agencies and private industry with the ultimate goal of completing a LiDAR survey of the entire state. TERRAINMAP.


These DEMs were produced using contour lines compiled for USGS 7. 1. Under the data sets tab, select Digital Elevation > SRTM > SRTM 1-ArcSecond Global . Click/tap the map or type the address in the text box. Topographic Change - in Philadelphia, During the Last Century: U S Geological Survey: 1996: Topographic Maps (DRG) for Pennsylvania 1:100,000 - UTM: U S Geological Survey: 1996: Topographic Maps (DRG) for Pennsylvania 1:24,000 - Albers - cropped collars: U S Geological Survey: 1996: Topographic Maps (DRG) for Pennsylvania 1:24,000 - UTM: U S The Topo50 map series provides topographic mapping for the New Zealand mainland, the Chatham Islands, and offshore islands at 1:50,000 scale. A LIDAR instrument principally consists of a laser, a scanner, and a specialized GPS receiver. Oahu at a scale of 1:6000.


SRTM Topography 1. 2 ASTER Global Digital Elevation Model OpenTopography is pleased to announce the release of a set of 2 meter DEMs from the 2013 Baluchistan 7. SRTM: NASA Shuttle Radar Topography Mission Jonathan de Ferranti's Digital Elevation Data site Where can you download the SRTM data? SRTM DEM data is being housed on the USGS Earth Explorer. I'm wondering is the topography changing with time in the model? Or is it fixed and as it is in the input file? Can anyone tell me where I can get the topography data (with the same resolution as the LE has)? Thanks 30-Meter SRTM Tile Downloader. The topographic data available through the LINZ Data Service is sourced directly from the LINZ Topographic database used in the production of the Topo50 map series (1:50,000 scale), Topo250 and Topo500. NYS Elevation Data . topo_4.


The instrument's design was essentially a modified version of Topography will be collected on a 5-year cycle concurrent with bathymetry. Parsons Laboratory, Department of Civil Engineering, Massachusetts Institute of Technology, Cambridge, MA, U. The Colorado Geological Survey is actively involved in the acquisition of LiDAR data within Colorado. The collection also includes space shuttle imagery, satellite imagery, topographic maps, and digital data. Accessing USGS topographic maps has never been easier. The topography data is treated as an index into the custom colormap. View all of our high-quality shaded relief USGS topo maps, Forest Service maps, satellite images, and custom map layers for free.


This document, Topographic and Bathymetric Data Considerations: Datums, Datum Conversion Techniques, and Data Integration (Data Considerations), is the second part of the Roadmap, and EXTRACT XYZ GRID - TOPOGRAPHY OR GRAVITY . will occur when incomplete surface range data match with part of the complete data set. These tests provided confirming data for validation of the final wind directionality factors, Kd, wind vertical profiles and the effect of topography on Kz exposure coefficient profiles. In a business of any kind, OS MasterMap Topography Layer gives you the confidence to make location-based decisions about LiDAR. Interpretation of a topography printout. (Bottom) Color-coded topography plotted in an equal-area projection with the same scale as that in Fig. Global Relief Data - Combined Topography and Bathymetry: Topographic data are vital for many scientific, technical, and other applications.


The spherical harmonic topography model and digital topography map products were generated by Nicole J. Topography is a term used in applied behavior analysis to describe behavior—specifically what behavior looks like. These options include sub-categories, file formats and data extent. (For more information on datums, please visit the National Geodetic Survey's Topographic Data Resources. The type is usually defined by the prevailing climate of the area. Zoom to your area of interest. The 1 second products are derived from the Shuttle Radar Topography Mission (SRTM) data and include a cleaned digital surface model (DSM), a bare-earth digital elevation model (DEM), a smoothed digital elevation model (DEM-S) and a hydrologically enforced Search for Data - Discover and access high resolution topography datasets via the Find Topography Data map interface.


This tool can be used to find an estimate for the elevation of a point on the earth. And I need the the topography data. It seems it is becoming the norm for point clouds to be used during the design process, so I thought that a quick post on how to generate native Revit topography from a laser scan source may be of interest. js Client for Google Maps Services. Correctly identify the patient, age and eye 30-Meter SRTM Tile Downloader. This mapping was done at different levels of detail, to support various land use and other purposes. This archive was produced by Jim Alexopoulos.


Please note that the ocean topography or land elevation datasets can be used to create new coastline datasets (extracting lat & lon for zero depth/ elevation) but read the dataset documentation, especially about the data processing, to determine how reliable coastline data will be when derived like this. With the use of USGS quad maps, we offer topos of every important region in the state. I have a polyline in Google Earth. Digital elevation models (DEM) with 10-meter spacing are available for most of New York thanks to a partnership between USGS and NYSDEC. The Elevation API is available in the Java Client, Python Client, Go Client and Node. 986 km along the z axis, and (C) 100-km baseline slopes. These detailed, online topo maps give a complete picture of the state, from high Mount Rogers to Chesapeake Bay.


Scientists and resource managers use NED data for global change research, hydrologic modeling, resource monitoring, mapping and visualization, and many other applications. These data are of two common types. Please see Florida Statewide LiDAR for more information. Washington State - GIS Data. When combined with Digital Elevation Models they can be used with Natural Scene Designer to create pictures like the one above Land topography is a digital image of the three-dimensional structure of the Earth's surface. Topographic maps of the land in meters and feet with geographic points of the earth. By describing the topography of behavior, you avoid many of the problematic terms that find their way into definitions of Topographic data is information about the features of the land, and is familiar to us all on maps.


ABSTRACT Channel networks with artibtrary drainage density or resolution can be extracted Image Archive Program: The Image Archive Program maintained by the Earth Data Analysis Center at the University of New Mexico hosts the largest collection of historical aerial photography data for New Mexico and the US Southwest. Position: not available. Of course, topographic maps are used for recreational purposes, such as travelling, hiking and orienteering, but they are also used by government and industry to assist with urban planning, mining, emergency management and the establishment of Image Archive Program: The Image Archive Program maintained by the Earth Data Analysis Center at the University of New Mexico hosts the largest collection of historical aerial photography data for New Mexico and the US Southwest. Topographic data provides detail on British Columbia's terrain, elevation and land features. An elevation source contains the data that defines the elevation surface. Topographic data provide information about the elevation of the surface of the Earth. In modern usage, this involves generation of elevation data in electronic form.


Topography defines behavior in an "operational" way, free of the coloration of values or expectation. The user is responsible to verify the limitations of the geospatial data and to use the data accordingly. The 3DEP data holdings serve as the elevation layer of The National Map, The Global Multi-Resolution Topography (GMRT) synthesis is a multi-resolutional compilation of edited multibeam sonar data collected by scientists and institutions worldwide, that is reviewed, processed and gridded by the MGDS Team and merged into a single continuously updated compilation of global elevation data. Geological Survey URL: Page Last Modified: Page Contact Information: The National MapThe National Map 1. You can also toggle previews for each dataset by using the checkboxes to the left. Recently, an updated version of the USGS GTOPO30 has also been released, with SRTM data used in place of the original data, when possible. The resulting product, known as US Topo, uses data from The National Map program to create topographic maps that are modeled on traditional maps but designed for nonspecialist users and published in the public domain as free downloads.


TARBOTON,' RAFAEL L. What is LiDAR? LiDAR is an optical remote sensing technology that measures properties of scattered light to find range and/or other information of a distant target. Need some basic Washington basemap layers? Try either the WA Dept of Ecology or the WA Office of Financial Management. For the most recent inventory of available LiDAR and digitial elevation data please visit United States Interagency Elevation Inventory. Power equipment may be used to modify topography, but the cost of such land renovation may… Read More Users can select one or more datasets. Digital Topographic Data Our topographic data is available for use in GIS applications, in the following scales which reflect their level of accuracy and best scale for use. Topographic LIDAR typically uses a near-infrared laser to map the land, while bathymetric Elevation Data Resources US Interagency Elevation Inventory 3D Elevation Program (3DEP) NOAA Coastal Service Center - Digital Coast CUGIR Elevation Data NYSDEC Lake Contour Maps LIDAR Coverage in NYS OS MasterMap Topography Layer® is the most detailed and accurate view of Great Britain's landscape – from roads to fields, to buildings and trees, fences, paths and more.


It is strongly recommended that these data are directly acquired from a U. With mountains, plateaus and coastal plains, TopoZone offers free and printable topographic maps of the state of Virginia. Local elevation sources can be either a raster that contains elevation information or a TIN dataset. PANCROMA. The WisconsinView Data Portal is the primary archive for Wisconsin public LiDAR projects, including data from counties, FEMA and the USGS national 3D Elevation Program . It is the current dataset of choice for digital elevation model (DEM) data since it has a fairly high resolution (1 arc-second, or around 25 meters), has near-global coverage (from 56°S to 60°N), and is in the public domain. topography data

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