GIS Data Sources

[rhumbaflappy]

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:

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.

 

[GaryGB]

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:

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


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

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

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

GaryGB

 

[rhumbaflappy]

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]

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]

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.

 

[GaryGB]

Here's a way to more directly access USGS data files without using The National Map Viewer web portal:

Can The National Map data be downloaded via direct links? | U.S. Geological Survey

Direct access to The National Map data is provided via browsable links through:  Amazon's Cloud USGS Server - https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/ Navigate to the appropriate theme folders to access staged products for download.  Data can also be downloaded using The...

www.usgs.gov

Example URL:

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


GaryGB

 

[crushnik]

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.

 

[GaryGB]

Hi Chris:

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

USGS Tile Servers for SBX?

I see where you can add tile servers to SBuilderX for ortho imagery, but I can't figure out how/where to do it. Google tiles are great, but I would prefer public domain imagery if at all possible so I can add golf courses to my scenery. It appears that the USGS server has the required specs to...

www.fsdeveloper.com

GaryGB

 

[GaryGB]

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

Global Terrain DEM (Esri)​

Global Terrain DEM (Esri)

A multi-resolution layer providing access to elevation values for use in analysis with functions for slope, aspect, and hillshade.

arc-gis-hub-home-arcgishub.hub.arcgis.com

"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 Data	Source Native Pixel Size	Approximate Pixel Size (m)	Primary Sources
England 2m	2 meters	2	Environment Agency
Wales 2m	2 meters	2	Natural Resources Wales
Netherlands 3m	3 meters	3	Rijkswaterstaat
Austria 10m	10 meters	10	Geoland
Denmark 3m	3.2 meters	3	Geodatastyrelsen
Denmark 10m	10 meters	10	Geodatastyrelsen
Finland 3m	3 meters	3	NLS
Finland 10m	10 meters	10	NLS
Norway 10m	10 meters	10	NMA
OS Terrain 50	50 meters	50	Ordnance Survey
FEMA LiDAR DTM	3 meters	3	FEMA
NED 1/9 arc second	0.000030864197530866 degrees	3	USGS
NED 1/3 arc second	0.000092592592593 degrees	10	USGS
NED 1 arc second	0.0002777777777779 degrees	31	USGS
NED 2 arc second	0.000555555555556 degrees	62	USGS
SRTM 1 arc second	0.0002777777777779 degrees	31	NASA
SRTM 1 arc second DEM-S	0.0002777777777779 degrees	31	Geoscience Australia
SRTM v4.1	0.00083333333333333 degrees	93	CGIAR-CSI
EarthEnv-DEM90	0.00083333333333333 degrees	93	N Robinson,NCEAS
GMTED2010 7.5 arc second	0.00208333333333333 degrees	232	USGS
GMTED2010 15 arc second	0.00416666666666666 degrees	464	USGS
GMTED2010 30 arc second	0.0083333333333333 degrees	928	USGS

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.

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

GaryGB