I want to use the rastermosaicker with parallel processing. Because the process takes days. So I want a common ID where the Y-coordinate is the same. (see ). What is the best way to solve this problem?
Solved
How can I create a common ID where y-coordinate is the same
+2- Contributor
Best answer by takashi
Hi @famjpdenboer, you can use the BoundsExtractor or the RasterPropertyExtractor to extract extents (xmin, ymin, xmax, ymax) for each raster. Then, group the rasters by ymin or ymax. If there could be a tolerance among the y values, consider rounding them.
This post is closed to further activity.
It may be an old question, an answered question, an implemented idea, or a notification-only post.
Please check post dates before relying on any information in a question or answer.
For follow-up or related questions, please post a new question or idea.
If there is a genuine update to be made, please contact us and request that the post is reopened.
It may be an old question, an answered question, an implemented idea, or a notification-only post.
Please check post dates before relying on any information in a question or answer.
For follow-up or related questions, please post a new question or idea.
If there is a genuine update to be made, please contact us and request that the post is reopened.
+7Hi @famjpdenboer
I think you can use the following combination of transformers to retrieve the x-coordinate:
- chopper (nb vertices = 1)
- CoordinateExtractor (y-coordinate)
- Statisticscalculator (f.e. minimum x-value per tile)
Now you will have for every tile 1 Y coordinate (the minimum of the tile) which can be used to group your tiles.
- Best Answer
Hi @famjpdenboer, you can use the BoundsExtractor or the RasterPropertyExtractor to extract extents (xmin, ymin, xmax, ymax) for each raster. Then, group the rasters by ymin or ymax. If there could be a tolerance among the y values, consider rounding them.
+7Hi @famjpdenboer, you can use the BoundsExtractor or the RasterPropertyExtractor to extract extents (xmin, ymin, xmax, ymax) for each raster. Then, group the rasters by ymin or ymax. If there could be a tolerance among the y values, consider rounding them.
Hi @famjpdenboer, you can use the BoundsExtractor or the RasterPropertyExtractor to extract extents (xmin, ymin, xmax, ymax) for each raster. Then, group the rasters by ymin or ymax. If there could be a tolerance among the y values, consider rounding them.
a. does this process output a single raster or one raster per group?
b. if it produces one raster per group, when creating massive mosaics would it make sense to use this workflow internally (e.g. 100tiles grouped and mosaicked into 5 groups of 20 tiles each, then mosaicking those 5 groups)
c. i'm having a bit of trouble adding the By Group functionality once the BoundsExtractor is complete. How do you view the added attributes of xmin, ymin, xmax, ymax to determine how to round/group them?
+59- Safer
For the record, our development team are investigating the parallel processing mode on the RasterMosaicker. We aren't convinced that it will actually produce results faster. For example (a+b)+(c+d) using parallel processing for a+b and c+d, might actually be slower than just doing a+b+c+d in the first place.
I'll let you what the result of the investigation is. If it's not good, we may remove the parallel processing option from this transformer.
Login to the community
No account yet? Create an account
An FME Account is required to contribute
LoginEnter your E-mail address. We'll send you an e-mail with instructions to reset your password.