Digital data acquisition

Citing and Permission for use of ASTER data (and others from LP DAAC)

Submitted by emarsh on Tue, 2008-01-29 11:37
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I just got a definitive email response on how to cite ASTER data (or other data from the same source), and that there are no restrictions on their use. I am publishing a paper in ESRI's ArcUser, whose the editor also got this email, so ESRI should now be aware (if they weren't before), that these data are acceptable for publication (you don't have to only use ESRI's data).

Thanks to Janice Wilson for clarifying this!

GIS data and imagery online

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Visit the file download area using one of the following

Matching ASTER Granule ID with Filenames

Submitted by nico on Mon, 2007-12-17 14:46
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This question/answer comes from the LPDAAC archives but the link is no longer online so I'm posting the formatted text here. Note that the naming conventions changed in 2003 (see below)

Peruvian Places in GoogleEarth

Submitted by nico on Fri, 2007-05-18 00:06
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GoogleEarth Places for Peru

If you use GoogleEarth you will probably appreciate these placenames for 100,000+ “centros poblados” in Peru that you can link to directly and display in Google Earth.

Connect by Adding a Network link to one of these KMZ (zipped KML) files by Department.
Zoom way in or there are just too many names to see.

How to convert ASTER EOS-HDF imagery to IMG in ERDAS Imagine 8.7

Submitted by nico on Sat, 2007-04-14 18:42
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Imagery from the ASTER instrument on the Terra platform is described at the JPL website. This description text was copied from p.24 of the following PDF file http://edcdaac.usgs.gov/aster/ASTER_GeoRef_FINAL.pdf

Importing ASTER (14DMO) DEM and Imagery into ArcGIS 9

Submitted by nico on Thu, 2007-03-15 08:12
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Steps to using ASTER14DMO DEM and Imagery data in ArcGIS 9.1 or 9.2

The ASTER14DMO format file contains 15 TIF files. These include 14 bands of imagery (V1-3n and 3b, S4-S9, T10-T14), and a DEM file. If you have an HDF file see this posting first. DEM 1. Open the TIF file and right-click layer > Data… > Export Data… choose Format: GRID 2. Give it a legal filename for GRIDs (short filename, no spaces or weird characters) 3.

Efficient Georeferencing in Arcmap

Submitted by nico on Mon, 2007-03-12 21:32
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Arcmap Map Georeferencing techniques and keyboard shortcuts that save time. Make pyramids before georeferencing. ArcCatalog (or toolbox) can batch Make Pyramids. Choose the reference that you will use to georeference the map. For historic maps and older datums the coordinates that make up the margins of the map frame are often best. In the case of South American topo maps a UTM grid is available but I’ve found the edge Lat/Longs to be more versatile and quicker to reference. Put the map frame in the destination coordinate system/datum (read from edge of paper map).

Aerial Photographs source archive

Submitted by Eric Schniter on Fri, 2006-12-15 17:06
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The following is an extensive list of providers of Aerial photographs (principally covering the USA).

This list was forwarded to Eric Schniter by friend Geoff Smick in environmental consulting, who is a co-worker of this guy:

Chris Zumwalt
GIS Technician
415-454-8868 x35

This is the list:

 

Importing DEM data from GeoTIFF in Arcmap

Submitted by nico on Mon, 2006-11-06 18:20
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Instructions for converting GeoTIFF DEM data to GRID in Arcmap

DEM data often arrive in the form of GeoTIFF that must be converted to GRID for further work in ArcGIS.

1. Acquire SRTM data as GeoTIFF and open in Arcmap. Right-click and Export... Export to GRID format. If you have a lot of grids you can automate this step, see below.

2. Reformat with the following command in Spatial Analyst under Raster Calculator:

setnull ( [GRIDNAME] < 0 , [GRIDNAME] )

That command sets all topographic values less than 0 (sea level) and the no-data collar area to <NULL>.

Converting HDF-EOS (ASTER) imagery to GeoTIFF

Submitted by nico on Thu, 2006-11-02 02:17
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How to convert the ASTER imagery (HDF format) into a more widely readable format.

[note: in 2007 some imagery from ASTER is arriving as 15 GeoTIFF files. If your ASTER data is in TIF files see this posting instead]

The program Geomatica Freeview is a good program for browsing and viewing HDF files, but it does not allow you to export to another format.

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