# SDR model results units **URL:** \ **Category:** Software Support\ **Tags:** sdr\ **Created:** [September 12, 2025, 5:14pm UTC](https://community.naturalcapitalalliance.org/t/sdr-model-results-units/6196 "2025-09-12T17:14:01Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![hkarimi](https://avatars.discourse-cdn.com/v4/letter/h/e480ec/32.png) [@hkarimi](https://community.naturalcapitalalliance.org/u/hkarimi)\ **Post date:** [September 12, 2025, 5:14pm UTC](https://community.naturalcapitalalliance.org/t/sdr-model-results-units/6196/1 "2025-09-12T17:14:01Z")
Hi all, I have recently completed SDR model for a part of the U.S. In the software goudline says “As of InVEST 3.15.0, the raster results of SDR are given as values _per hectare_. To convert the per hectare values to per pixel values, adjust by the size of your pixels relative to one hectare. For example: If _1 pixel = 900 m2_, then the conversion from metric tons per hectare (t/ha) to metric tons per pixel (t/pixel) would be: _(t/ha x 1/10000 ha/m2 x 900 m2/pixel)_ or _(the per hectare value x (900/10000))_. The number will get smaller when the pixel size is smaller than a hectare.”. However, I used layer version available in the website; version InVEST 3.1.6.2. I am wondering to know if still this version provide result as tons per hectare or it is per pixel? Hazhir ---
**Author:** ![csimpson](https://avatars.discourse-cdn.com/v4/letter/c/76d3ee/32.png) [@csimpson](https://community.naturalcapitalalliance.org/u/csimpson)\ **Post date:** [September 12, 2025, 7:42pm UTC](https://community.naturalcapitalalliance.org/t/sdr-model-results-units/6196/2 "2025-09-12T19:42:37Z")
Hi @hkarimi, Yes, all versions of InVEST that have been released since 3.15 also provide per hectare outputs for SDR. ---
**Author:** ![hkarimi](https://avatars.discourse-cdn.com/v4/letter/h/e480ec/32.png) [@hkarimi](https://community.naturalcapitalalliance.org/u/hkarimi)\ **Post date:** [September 12, 2025, 8:23pm UTC](https://community.naturalcapitalalliance.org/t/sdr-model-results-units/6196/3 "2025-09-12T20:23:50Z")
Thank you so much for clarifying. For my my model for US SOutheats that is forested lands and flat slope, results of soil loss and sediment export are from 0-2 t/ha. Does this value make sense? Hazhir ---
**Author:** ![csimpson](https://avatars.discourse-cdn.com/v4/letter/c/76d3ee/32.png) [@csimpson](https://community.naturalcapitalalliance.org/u/csimpson)\ **Post date:** [September 12, 2025, 9:30pm UTC](https://community.naturalcapitalalliance.org/t/sdr-model-results-units/6196/4 "2025-09-12T21:30:26Z")
Hi @hkarimi, You are correct in understanding that slope is an important driver, however unfortunately I don’t have the knowledge of your study area/data to evaluate those specific output values. If you are concerned I would recommend comparing your outputs to observed data. The User’s guide has a section about this: [SDR: Sediment Delivery Ratio — InVEST® documentation](https://storage.googleapis.com/releases.naturalcapitalproject.org/invest-userguide/latest/en/sdr.html#calibration-comparison-with-observed-data) . Please let me know if you have additional concerns! ---
**Author:** ![hkarimi](https://avatars.discourse-cdn.com/v4/letter/h/e480ec/32.png) [@hkarimi](https://community.naturalcapitalalliance.org/u/hkarimi)\ **Post date:** [September 12, 2025, 9:35pm UTC](https://community.naturalcapitalalliance.org/t/sdr-model-results-units/6196/5 "2025-09-12T21:35:18Z")
Thank you very much for clarification and your time. Bests, Hazhir ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/naturalcapitalproject/original/2X/8/8d95591aa074da87ea0fdd61ca47c1c3c0588aa7.png) [@system](https://community.naturalcapitalalliance.org/u/system)\ **Post date:** [October 15, 2025, 1:41pm UTC](https://community.naturalcapitalalliance.org/t/sdr-model-results-units/6196/6 "2025-10-15T13:41:34Z")
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