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Posted to issues@commons.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/09/09 02:06:00 UTC
[jira] [Work logged] (IMAGING-266) Read integer data from GeoTIFFS
[ https://issues.apache.org/jira/browse/IMAGING-266?focusedWorklogId=648322&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-648322 ]
ASF GitHub Bot logged work on IMAGING-266:
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Author: ASF GitHub Bot
Created on: 09/Sep/21 02:05
Start Date: 09/Sep/21 02:05
Worklog Time Spent: 10m
Work Description: gwlucastrig opened a new pull request #165:
URL: https://github.com/apache/commons-imaging/pull/165
Updates to the TIFF API to support access to numeric data from TIFF files. This change addresses JIRA item IMAGING-266.
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Issue Time Tracking
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Worklog Id: (was: 648322)
Remaining Estimate: 0h
Time Spent: 10m
> Read integer data from GeoTIFFS
> --------------------------------
>
> Key: IMAGING-266
> URL: https://issues.apache.org/jira/browse/IMAGING-266
> Project: Commons Imaging
> Issue Type: New Feature
> Components: Format: TIFF
> Affects Versions: 1.0-alpha3
> Reporter: Gary Lucas
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> I recently discovered that there is a large amount of digital elevation data available in the form of 16-bit integer coded data in GeoTIFF files (TIFF files with geographic tags). I propose to enhance the Commons Imaging API to read these files. This work will be similar to the work I did for reading floating-point raster data under ISSUE-251.
> Available data include the nearly-global coverage of one-second of arc elevation data produced from the Shuttle Radar Topography Mission (SRTM) and other sources. These products give grids of elevation data with a 30 meter cell spacing for most of the world's land masses. They are available at NASA Earthdata and Japan Space Systems websites, see [https://asterweb.jpl.nasa.gov/gdem.asp|https://asterweb.jpl.nasa.gov/gdem.asp] There is also a ocean bathymetry data set available in this format at [http://www.shadedrelief.com/blue-earth/]
> This new feature will continue to expand the usefulness of the Commons Imaging API in accessing GeoTIFF products.
> Request for Feedback
> So far, the data products I've found (ASTER and Blue Earth Bathymetry) give elevation and ocean depth data in meters recorded as a short integer. I haven't found an example of where the 32-bit integer format is used. For now, I am planning on only coding the 16-bit integer variation. Does anyone know if the 32-bit version is worth supporting? My criteria for determining that would be based on whether there is a significant number of projects using that format (life is too short to chase rarely used data formats).
> Currently, one of the code-analysis operations conducted by the Commons Imaging build process is coverage by JUnit tests. Lacking any test data for the 32-bit case, I am reluctant to include it in the code base because it would mean putting uncovered code into the distribution.
> Also, I am wondering about the best design for the access API. The current TiffImageParser class has a method called getFloatingPointRasterData() that returns an instance of TiffRasterData. TiffRasterData is pretty much hard-wired to floating point data. I am thinking of creating a new method called getIntegerRasterData() that would return an instance of a new class called TiffIntegerRasterData. Does this seem reasonable? I considered trying to combine both kinds of results into a unified class and method, but it seems more unwieldy than useful.
>
>
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