Timeline for Point/Area location of data in reference to geotransform of raster
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Oct 9, 2019 at 0:25 | comment | added | Vince | The pixel doesn't refer to any one point -- it's a pixel, so it refers to all of them (which makes a shift of up to 1/2 pixel size "safe"). If you choose to use center-center (also at the 1/2 pixel threshold), it's not likely someone will have a convincing reason that it's wrong. | |
| Oct 8, 2019 at 19:47 | comment | added | Naxos | @Vince Sorry about that, I've got it down to one '?' now! What empirical tool are you referring to? I suppose an alternate formulation of the original question might be: Where within the pixel does a point value refer, and where within the pixel is center of the area? | |
| Oct 8, 2019 at 19:43 | comment | added | Vince | You've got a TL/DR issue here. Six actual question marks in two labeled questions isn't helping. This topic is rather fundamental to the definition of rasters, but touches on the imagery equivalent of physics' wave/particle duality -- Is a pixel a point or an area? Since the answer is both, the measures of image extents share that awkwardness, sometimes UL-Center -> LR Center, and sometimes UL Corner to LR Corner (or even LL Corner to UR Corner). Given that you have empirical tool available, you can answer how GDAL handles this without asking others for their interpretation. | |
| Oct 8, 2019 at 19:38 | history | edited | Naxos |
+gdal tag
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| Oct 8, 2019 at 19:35 | comment | added | Naxos | @Vince I have reformulated the questions into a single, hopefully-clearer question. Thank you! | |
| Oct 8, 2019 at 19:32 | history | edited | Naxos | CC BY-SA 4.0 |
Changed wording of question for clarity (hopefully). Added vertex example
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| Oct 8, 2019 at 18:53 | history | rollback | Naxos |
Rollback to Revision 1
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| Oct 8, 2019 at 18:37 | history | edited | Naxos | CC BY-SA 4.0 |
deleted 21 characters in body
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| Oct 8, 2019 at 18:31 | comment | added | Vince | Welcome to GIS SE. As a new user, please take the Tour which emphasizes the importance of asking One question per Question. Please edit your question to ask one question. | |
| Oct 8, 2019 at 17:55 | review | First posts | |||
| Oct 8, 2019 at 18:32 | |||||
| Oct 8, 2019 at 17:51 | history | asked | Naxos | CC BY-SA 4.0 |