network profile
| bio | website | |
|---|---|---|
| location | ||
| age | ||
| visits | member for | 10 months |
| seen | 2 days ago | |
| stats | profile views | 2 |
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Sep 18 |
accepted | Proximity query approach |
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Sep 18 |
comment |
Proximity query approach Great, this approach works perfectly. Thanks! |
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Sep 18 |
asked | Proximity query approach |
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Jul 29 |
awarded | Scholar |
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Jul 29 |
accepted | Does a value in srtm dem file refer to the center or corner of a cell? |
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Jul 29 |
awarded | Supporter |
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Jul 29 |
comment |
Does a value in srtm dem file refer to the center or corner of a cell? Thanks. Your second-to-last paragraph answers the question exactly as it describes the meaning of xllcorner/yllcorner rather than the meaning of the filename (which is also useful but wasn't my question). Anyone else with this question should note that the excerpt from Nasa's documentation (first quote above) explains the meaning of the filename not xllcorner/yllcorner. I also think the link to the ASCII grid file on wikipedia is the most relevant reference for anyone else who has this same question. |
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Jul 29 |
comment |
Does a value in srtm dem file refer to the center or corner of a cell? Thanks this does give some context, given that a cell represents the average height for all records in that polygon then the most accurate way for me to generate a point from each pixel is to treat the value as the elevation at the centroid. |
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Jul 29 |
comment |
Does a value in srtm dem file refer to the center or corner of a cell? Thanks, you're right, (xllcorner, yllcorner) is ALMOST exactly half a cellsize off from being on an exact degree. |
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Jul 29 |
comment |
Does a value in srtm dem file refer to the center or corner of a cell? Thanks very much for that link, I thought the format should be documented somewhere but didn't know where to look. This explains it pretty well. It's interesting to note that "To be more exact, these coordinates refer to the geometric center of the lower left pixel" - indicates that the filename references the center of the lower left pixel. I think though that the xllcorner and yllcorner fields in side the file represent the lower left corner of the lower left tile though. Thanks! |
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Jul 27 |
awarded | Student |
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Jul 27 |
asked | Does a value in srtm dem file refer to the center or corner of a cell? |
