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GIS Data Sources

rhumbaflappy

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Here's an app that will take a TXT file from SBuilderX, and build a geojson file for import use with the HOT export tool website or for use with any GIS program. Drag'n'drop the file ending in the extension .TXT or .txt and containing lines that contain the coordinates like so:

Code:
North=42.6415356943999
South=42.6273912675641
West=-88.6033630371094
East=-88.5985565185547

You should be able to use this to get OSM data for use with scenproc to automate the process to create AGN autogen files.
 

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Coming in 2016:

Free 30m DEM from JAXA:

http://www.eorc.jaxa.jp/ALOS/en/aw3d/index_e.htm


This should be much more accurate than SRTM or ASTER, as I understand. The free 30m data is down-sampled from 5m data.

EDIT--

Some missing data, and doesn't seem to improve over SRTM 1 ARC Second. Perhaps wen the full data set is ready it will be OK...

Dick

I have not tested this yet, but it will be interesting to compare the above data set:

https://www.eorc.jaxa.jp/ALOS/en/aw3d30/index.htm


...with the forthcoming NASADEM: :idea:

https://earthdata.nasa.gov/esds/competitive-programs/measures/nasadem


Reportedly, there is now a prototype NASADEM data set available: :pushpin:

https://gis.stackexchange.com/questions/267134/what-is-nasadem-and-when-it-will-be-released

https://e4ftl01.cr.usgs.gov/provisional/MEaSUREs/NASADEM/

GaryGB
 
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rhumbaflappy

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NASADEM is basically void-filled SRTM + ASTER, at 30 meters. Nothing new, just reworked data. Might be a real nice set, but no finer resolution than that already offered.
 

rhumbaflappy

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Hey Gary.

I looked at some of the data for NASADEM. It looks like they have reworked the water masking a bit. I don't know why they stopped at N60 and S56. It excludes some interesting terrain.
 

rhumbaflappy

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Hey Gary.

I looked at some of the data for NASADEM. It looks like they have reworked the water masking a bit. I don't know why they stopped at N60 and S56. It excludes some interesting terrain.
I take it back, regarding the water masking. Same old masking. Same old errors.
 
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Here's a way to more directly access USGS data files without using The National Map Viewer web portal:


Example URL:

ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/13/TIFF/


GaryGB
 
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I can now find everything but ortho images now, Gary - thanks! Hunting for a back door for that too, and I'll share if I can find one.
 
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Hi Chris:

I replied to this latter post in your thread ...here:


GaryGB
 
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Here is a (relatively) new DEM data set which may provide an even higher resolution source than most "global" DEMs in some areas: :idea:

Global Terrain DEM (Esri)​



"This dynamic image service provides numeric values representing ground surface heights, based on a digital terrain model (DTM). The ground heights are based on multiple sources. Heights are orthometric (sea level = 0), and water bodies that are above sea level have approximated nominal water heights.

Data Sources: The data for this layer comes from the multiple sources listed below, with original source data in its native coordinate system. Depending on the scale being viewed; data from one of these datasets will be returned:

Source DataSource Native Pixel SizeApproximate Pixel Size (m)Primary Sources
England 2m2 meters2Environment Agency
Wales 2m2 meters2Natural Resources Wales
Netherlands 3m3 meters3Rijkswaterstaat
Austria 10m10 meters10Geoland
Denmark 3m3.2 meters3Geodatastyrelsen
Denmark 10m10 meters10Geodatastyrelsen
Finland 3m3 meters3NLS
Finland 10m10 meters10NLS
Norway 10m10 meters10NMA
OS Terrain 5050 meters50Ordnance Survey
FEMA LiDAR DTM3 meters3FEMA
NED 1/9 arc second0.000030864197530866 degrees3USGS
NED 1/3 arc second0.000092592592593 degrees10USGS
NED 1 arc second0.0002777777777779 degrees31USGS
NED 2 arc second0.000555555555556 degrees62USGS
SRTM 1 arc second0.0002777777777779 degrees31NASA
SRTM 1 arc second DEM-S0.0002777777777779 degrees31Geoscience Australia
SRTM v4.10.00083333333333333 degrees93CGIAR-CSI
EarthEnv-DEM900.00083333333333333 degrees93N Robinson,NCEAS
GMTED2010 7.5 arc second0.00208333333333333 degrees232USGS
GMTED2010 15 arc second0.00416666666666666 degrees464USGS
GMTED2010 30 arc second0.0083333333333333 degrees928USGS
Data Coverage: To see the coverage of various datasets comprising this service, click here.

Accuracy: The accuracy of these services will vary as a function of location and data source. Please refer to the metadata available in the services, and follow the links to the original sources for further details. An estimate of CE90 and LE90 are included as attributes.
For more information on this service, including the terms of use, visit us online."


PS: The 'dynamic' web portal is able to extract only 'filtered' Map view areas specified by end users, so output extents 'may' not be 1x1 degree tiles. :alert:

NOTE: Map zoom level dynamically determines output resolution of ex: GeoTIFF DEMs, so consistent extraction extents may require 'API' inputs.

GaryGB
 
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