# SDR sed\_export results

**URL:** <https://community.naturalcapitalalliance.org/t/sdr-sed-export-results/3914>\
**Category:** Science, Research & Data\
**Tags:** sdr\
**Created:** [July 7, 2023, 8:44pm UTC](https://community.naturalcapitalalliance.org/t/sdr-sed-export-results/3914 "2023-07-07T20:44:08Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![valeria.b](https://avatars.discourse-cdn.com/v4/letter/v/34f0e0/32.png) [@valeria.b](https://community.naturalcapitalalliance.org/u/valeria.b)\
**Post date:** [July 7, 2023, 8:44pm UTC](https://community.naturalcapitalalliance.org/t/sdr-sed-export-results/3914/1 "2023-07-07T20:44:08Z")

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Hello everybody,

I have a question with my results of Sed\_export, when I sum the tons of sed\_export.tif they do not coincide with those reported on the watershed results.  
I understand that they must be the same or should I do some conversions?

Thanks for your help!!

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**Author:** ![esoth](https://avatars.discourse-cdn.com/v4/letter/e/9d8465/32.png) [@esoth](https://community.naturalcapitalalliance.org/u/esoth)\
**Post date:** [July 10, 2023, 10:25pm UTC](https://community.naturalcapitalalliance.org/t/sdr-sed-export-results/3914/2 "2023-07-10T22:25:36Z")

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The value of `sed_export` in the watershed results table should equal the sum of the pixels in `sed_export.tif` that fall within the watershed area. The model converts from tons/hectare to tons/pixel, so you should not need do any conversion.

How are you calculating the sum and what are your results?

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**Author:** ![valeria.b](https://avatars.discourse-cdn.com/v4/letter/v/34f0e0/32.png) [@valeria.b](https://community.naturalcapitalalliance.org/u/valeria.b)\
**Post date:** [July 10, 2023, 11:00pm UTC](https://community.naturalcapitalalliance.org/t/sdr-sed-export-results/3914/3 "2023-07-10T23:00:56Z")

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Thanks for your answer.

What I want to do with my data is to calculate the contribution of land use to the sediments exported in the basin. Therefore, I calculated the ton/ha in the basin (pixel: 20x20), but this does not match the value reported in the watershed results.

Could you tell me the most efficient way to calculate the contribution of land use to the amount of sediments exported?

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**Author:** ![esoth](https://avatars.discourse-cdn.com/v4/letter/e/9d8465/32.png) [@esoth](https://community.naturalcapitalalliance.org/u/esoth)\
**Post date:** [July 10, 2023, 11:27pm UTC](https://community.naturalcapitalalliance.org/t/sdr-sed-export-results/3914/4 "2023-07-10T23:27:21Z")

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I’m not sure exactly what you mean by “the contribution of land use to the amount of sediments exported”. Have you looked at the avoided erosion and avoided export outputs? These quantify the sediment retention service.

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**Author:** ![Elly](https://avatars.discourse-cdn.com/v4/letter/e/5f8ce5/32.png) [@Elly](https://community.naturalcapitalalliance.org/u/Elly)\
**Post date:** [July 17, 2023, 11:17am UTC](https://community.naturalcapitalalliance.org/t/sdr-sed-export-results/3914/5 "2023-07-17T11:17:54Z")

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Note: output of sed\_export.tif is in (ton/pixel/year). If you want to check results of sed\_export just open "attribute table in “watershed\_results\_sdr”. Then navigate to “Sed\_export”. Results will be in (ton/year). If you want to access contribution of each LULC to sed\_export, import your sed\_export.tiff in GIS, then, spatial analyst tool\>Zonal\>Zonal statististics as table, in the input raster or feature zone data “enter your LULC.tiff”, in the input value raster “enter your sed\_export”. Click Ok and enjoy. Note: Multiply “pixel count with mean value of each LULC”. all the best.