Digital elevation model dem formats macodrum library. Resolution is typically defined in either geographic reference arc second, or rectangular grid precise meter spacing. Nearly all published terrain elevation data is in the form of data grids. Click on title to download individual files attached to this item. Elevation data is a digital representation of the earths terrain. A global 1km resolution land surface digital elevation model dem derived from united states geological survey usgs 30 arcsecond srtm30 gridded dem data created from the nasa shuttle radar. World digital elevation model etopo5 european environment. Digital elevation models dems are gridded raster where each pixel of the image has a value, the elevation above.
Stephen b delong, usgs earthquake hazards program, as a service to the community. 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. Visit the arcticdem page for downloads, documentation, and more information. However, these data were not classified in a manner that allowed for easy differentiation. A raster file is a regular grid of cells, all of which are the same size.
The netcdf files were updated to include the mean administrative unit area layer, the land area and water area layers, and two layers indicating the administrative levels of the demographic characteristics input data. Earthexplorer offers srtm data with a regularly spaced grid of elevation points in three file formats. What are different sites for downloading digital elevation models. This is the download page for the ensembles daily gridded observational dataset for precipitation, temperature and sea level pressure in europe called eobs. Some people use dtm digital terrain model as the more general term. The scaled integer gridded digital elevation model sigdem is a binary file format containing gridded digital elevation model data.
A byproduct of this work is detailed elevation data collected by airborne lidar sensors. Generate contour lines from raster dem terrain grid in global mapper. Etopo5 was generated from a digital data base of land and seafloor elevations on a 5minute latitudelongitude grid. The ned assembly process involves edge matching and mosaicking elevation data into ned layers.
Classified point cloud and gridded elevation data from the. The files for this data set are available as global rasters in geotiff, ascii text, and netcdf format. This dataset is called the gridded ssurgo gssurgo database and is derived from the soil survey geographic ssurgo database. Points2grid is a robust and scalable tool for gridding lidar point cloud data to generate digital elevation models dems. Points2grid uses a local gridding method to compute grid cell elevation using a neighborhood defined around each cell based on a search. Earthexplorer use earthexplorer to search for and download a variety of imagery datasets managed by usgs. Elevation data sources nc state university libraries. The data filea are included in a zip file along with the data set documentation.
Laz in cloud when exporting lidar data urls to text from the cart the user can specify whether to include files in laz only, las only or both formats if both types are present in the cart. Under the data sets tab, select digital elevation srtm srtm 1arcsecond global. Digital elevation data for the entire globe now available on the cgiarcsi geoportal. A local gridding method for dem generation from lidar point cloud data. United states department of agriculture, natural resources conservation service. Srtm dem data is being housed on the usgs earth explorer. These data can provide important inputs for ecological, agricultural, and hydrological models. For more on viewing lidar point cloud data using the plas. This is a commonly used format that can be directly used in arcanything, divagis, and many other programs. Erroneous no data pixels in all of the gridded data were recoded as 0 in cases where census reported known 0 values. The following sections describe some common data formats for terrain data, and how to access and prepare data.
The implementation profile for defense gridded elevation data dged describes the data content, structure and metadata requirements required to create a suite of gridded elevation data products. The raster data sets are constructed from national or subnational input administrative units to which the estimates have been matched. National value added look up valu table database for the gridded soil survey geographic gssurgo database for the united states of america and the territories, commonwealths, and island nations served by the usda nrcs. The global multiresolution terrain elevation data 2010 gmted2010 provides a new level of detail in global topographic data. The data latency depends on the level of the data product. Etopo2v2 2 minute worldwide bathymetrytopography grids nceiv.
Ned is designed to provide national elevation data in a seamless form with consistent datums, elevation unit, and coordinate reference system. The resolution of the gridded data varies from true 5minute for the ocean floors, the usa. Types of data grids and raster display functions described basic approaches to rendering surface data grids with mapping toolbox functions, including viewing surfaces in 3d axes. Data can be represented as points x,y,z or in a gridded format raster. Gpwv4 is gridded with an output resolution of 30 arcseconds approximately 1 km at the equator. You can understand ordered data by thinking about how. The national hydrography datasets, watershed boundary dataset, governmental boundary units, transportation, structures, elevation contours and geographic. This openfile of bedrock elevation be and depth to bedrock dt grids and data points for minnesota represents the first phase of an ongoing process to create new statewide maps from these data. Kaplan sst gridded global sst anomalies from 1856present derived from uk met office sst data which has had sophisticated statistical techniques applied to it to fill in gaps. Digital elevation data which describes australias landforms and seabed is crucial for addressing issues relating to the impacts of climate change, disaster management, water security, environmental management, urban planning and infrastructure design. Global mapper gridded elevation formats blue marble geo.
The ascii file has a builtin header and then lines of data which is. If you have waited more than ten seconds and you still see this message, please click the link above to proceed to the new site. Lidar data products are most often worked within a gridded or raster data format. Jan 31, 2017 high resolution global gridded data for use in population studies. This reprocessed classified dataset allows researchers easy and direct access to a bareearth digital elevation data set as gridded halfmeter resolution rasters elevation and shaded relief, fullfeature digital elevation models as gridded onemeter resolution rasters elevation and shaded relief and as classified according to asprs. The reprocessing of the 2005 b4 dataset was performed by dr. For more detailed information about each product, please choose from the menu bar at the top of the screen. Gridded cded format dems can be downloaded free using this link. Gravsoft grid files are used by the gravsoft suite of tools to store gridded elevation data. Global 1km digital raster data derived from a variety of sources. The global land onekilometer base elevation globe project is a 30arcsecond 1km gridded, qualitycontrolled global digital elevation model dem. This is also available by rightclicking on layers in the overlay control center, under the analysis sub menu. Gtopo30 is a global digital elevation model dem with a horizontal grid spacing of 30.
The data available here were originally published on the usgs sciencebase website as classified point cloud and gridded elevation data from the 2005 b4 lidar project, southern california, usa. High resolution global gridded data for use in population studies. In matlab, gridded data means data ordered in a grid. Click view basket when you are ready to download your data, or to manage the items you have added so far. The gmted2010 product suite contains seven new raster elevation products for each of the 30, 15, and 7. Img from erdas elevation data may be stored in the img format, which is supported by arcgis. Elevation mapper elevation map creator, global elevation data a unique application to create customized digital elevation maps. Osip data available on this tab represent 6in imagery and 1m lidar files obtained through the osip cooperative purchase agreement.
It includes a standard and enhanced version with ncep reanalysis from 1979 to near the present. Staged productsthe topographic maps and geographical information system gis data provided in the national map are pregenerated into downloadable products often available in multiple formats. Digital elevation data are available through the national map download client. North america elevation 1kilometer resolution grid.
These data have provided a fundamental resource for study of active faulting in southern california since they were released in 2005. For quick access to data, apps and services, please select from the tabbed menu below. But heres a usgs earth explorer download guide to help you get started. When you click download your data, if the data can be delivered quickly it will be downloaded directly through your browser after a few seconds. Us, international raster grid sources a valuable online publically available source of rasterbased or grid elevation data for locations outside of north carolina is the usgs national map. The grid values represent the elevation at the grid intersections at odd multiples of 2 minutes of latitude and longitude, averaged over the cells area.
The ascii and geotiff data are available at the native 30 arcsecond resolution and four lower resolutions. With any vector data loaded containing an elevation component, create an elevation grid by choosing this option in the analysis menu or using the analysis toolbar button. Digital elevation models dems are gridded raster where each pixel of the image has a value, the elevation above a model of the earth wgs84 ellipsoid, for example. The data were originally collected from various sources by margo edwards in 1988 while at washington university, st.
The last grid cell contains the elevation for the coordinates maxx, maxy. A suite of gridded products describing surface elevation, icethickness and the sea. The ministry of economy, trade, and industry meti of japan and the united states national aeronautics and space administration nasa jointly announced the release of the advanced spaceborne thermal emission and reflection radiometer aster global digital elevation model version 3 gdem 003, and the aster. Etopo1 is a 1 arcminute global relief model of earths surface that integrates land topography and ocean bathymetry. Digital elevation model province of british columbia. This page describes the lro lunar orbiter laser altimeter lola data sets hosted at the pds geosciences node, tools for accessing data, and information about the latest lola data release. The global land onekilometer base elevation globe project is a 30arc second 1km gridded, qualitycontrolled global digital elevation model dem. These data are available for download from the usda geospatial data gateway select direct data download and soil geographic databases. The preceding results show that gridded precipitation datasets which interpolate gauge data across complex terrain may have mean absolute differences in wateryear total precipitation of several hundred mm in highelevation areas, and mean relative differences of 1030% over many of the same areas. Data collection and recording are in unit of files, which typically contain four, five, six, or ten minutes of base data depending on the volume coverage pattern. The 8x data files are quite large, so you may only be able to download them if you have a fast network connection.
Srtm digital elevation model dem data file format 36 and is minimally processed from the source image sensor. A smaller postspacing gives the data a higher resolution and therefore more terrain detail. The national elevation dataset ned is a seamless raster product primarily derived from usgs 10 and 30meter digital elevation models dems. Data download texas natural resources information system. Gridded soil survey geographic gssurgo10 database for the. A digital elevation model dem is a 3d cg representation of a terrains surface commonly of a planet e.
Earth, moon, or asteroid created from a terrains elevation data. Etopo2v2 is in the cylindrical equidistant projection sometimes called latitudelongitude, or geographic. Download free dem digital elevation model 10 meters by. What types of elevation datasets are available, what formats do they. Etopo5 5minute gridded elevation data this data set is superseded by the latest global relief model. Ssurgo is generally the most detailed level of soil geographic data developed by the national cooperative soil survey ncss in accordance with ncss mapping standards. Gridded soil survey geographic gssurgo database for the conterminous united states. This interface attempts to ease the pain of downloading 30meter resolution elevation data from the shuttle radar topography mission click on yellow tiles to download their corresponding data tiles come as zipped srtmhgt files at 1arcsecond resolution 3601x3601 pixels in a latitudelongitude projection, downloaded from nasa. The nine data sets of the current release are collectively referred to as the revision 11 or v4. Size of file is about 68m per variable per month for monthly data. The national hydrography datasets, watershed boundary dataset, governmental boundary units, transportation, structures, elevation contours and. The cgiarcsi is now able to provide holefilled seamless srtm 90mdigital elevation data for almost the entire globe for download. Bag bathymetry attributed grid this format is used for bathymetric data and is partially supported in arcgis 10.
High resolution global gridded data for use in population. Dgiwg is the multinational body responsible for geospatial standardization for the defence organizations of member nations. This product implementation profile for gridded elevation data products has been developed to support defense requirements for a uniform, orthogonal gridbased geospatial elevation model for a wide range of geospatial resolutions, in order to ensure interoperability between implementations of elevation products and their specifications. Level of data resolution refers to the ground sampling distance, or postspacing, of elevation data. We have also extended these data to cover southern british columbia in our real time products. The gravity and terrain correction extension is a complete system for processing and reducing gravity data from ground, shipborne and airborne surveys and applying terrain corrections from digital elevation models or gridded elevation data. Ncsu campus elevation data see the ncsu campus gis data webpage for lidar data derivatives. The elevation data is stored immediately after the header in grid cells, ordered by row relative to the lowest left corner of the files bounding box. Vector data are stored as esri shapefiles grid raster data are stored as diva gridfiles each shapefile consist of at least three actual files.
Monthly and pentad global gridded precipitation means. Description of gridded soil survey geographic gssurgo database. Plots are automatically georeferenced in kml files. Raw preprocessed lidar data, and more recent ql2 lidar data and dems for piedmont and eastern portions of nc can be obtained from the ncem data download website anyone can create an ncid for logging in. This data set is derived from the original 2005 data collected over the southern san andreas and san jacinto fault zones in southern california, usa. You will be transferred to the new site in a moment.
Interpolating gridded data gridded data representation. Data latency times that is the time lag between when data are acquired and when a particular product is available are given below. Download some dems below and then follow our stepbystep guide on. Click on a county to download lbrs data for ohio this download tool provides access to countywide osip and lbrs datasets as well as individual tiles of osip elevation and highresolution imagery data. Defense gridded elevation data product implementation profile. A global dem refers to a discrete global grid dems are used often in geographic information systems, and are the most common basis for digitally produced relief maps. The etopo5 dataset comes from a digital database of land and sea floor elevation on a 5minute latitude and longitude grid. Description of gridded soil survey geographic gssurgo. Opentopography b4 project southern san andreas and san. The srtm dems have a resolution of 90m, and are provided in 5 deg x 5 deg tiles for easy download and use. A data file consists of a 24byte volume scan header record followed by numerous 2,432byte base data and message records. Dted level 2 is a uniform gridded matrix of terrain elevation values with post spacing of one arc second approximately 30 meters. Gridded daily and monthly olr data from ncar with temporal interpolation. Elevation data providing height above the sea level in meters for every single place in the world.
A new release is planned for the second quarter of each federal fiscal year. Nrcs is a member agency of the national digital elevation program. Each file or cell contains a matrix of vertical elevation values spaced at regular horizontal intervals measured in geographic latitude and longitude units. Global mapper gridded elevation formats blue marble geographics. Dted level 2 is the basic high resolution elevation data source for all military activities and systems that require landform, slope, elevation, andor terrain roughness in a digital format. The north america elevation data were derived from the gtopo30 elevation dataset.
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. Usgs eros archive digital elevation global 30 arcsecond. The software properly reads the raster elevation data but does not completely support all format components such as golden points. Jisao data elevation data in netcdf 1degree latitudelongitude resolution elevations, light shading for elevations 5000m, and increasingly darker shades for elevations 0 and 1500m.
Gtopo30 is a global digital elevation model dem with a horizontal grid spacing of. The national elevation dataset ned is a raster product assembled by the u. It has the following elevation data products available at us. An assessment of differences in gridded precipitation. This example shows how to create a 2d grid using meshgrid and ndgrid.
Ofr0602, maps of gridded bedrock elevation and depth to. The term dem digital elevation model can refer either to a specific elevation file format, or to gridded elevation data in general. The first grid cell stores the elevation for the coordinates minx,miny. Jul 18, 2008 etopo5 5minute gridded elevation data this data set is superseded by the latest global relief model. The resolution of the gridded data varies from true 5minute for the ocean. Elevation data in netcdf 1degree latitudelongitude resolution elevations, light shading for elevations 5000m, and increasingly darker shades for elevations 0 and 1500m. Click the how to link at the top of the viewer for detailed instructions on how to.
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