# Urban Flood Mitigation IndexError: index out of range

**URL:** <https://community.naturalcapitalalliance.org/t/urban-flood-mitigation-indexerror-index-out-of-range/918>\
**Category:** Software Support\
**Tags:** urban-flood\
**Created:** [April 8, 2020, 4:49pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-mitigation-indexerror-index-out-of-range/918 "2020-04-08T16:49:19Z")\
**Posts on this page:** 9\
**Page:** 1

<div class="post-metadata">

**Author:** ![kblann](https://avatars.discourse-cdn.com/v4/letter/k/67e7ee/32.png) [@kblann](https://community.naturalcapitalalliance.org/u/kblann)\
**Post date:** [April 8, 2020, 4:49pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-mitigation-indexerror-index-out-of-range/918/1 "2020-04-08T16:49:19Z")

</div>

Hi, I just started trying to run the Urban Flood Mitigation model today. I have my curve number table, HSG raster, and land use raster (no infrastructure data). I got the following errors after the rasters were aligned, during the curve number task: (IndexError: index (128) out of range)  
2020-04-07 16:30:44,673 utils.prepare\_workspace(115) INFO Writing log messages to C:\Users\KBLANN\Documents\urban\_flood\_risk\_mitigation\_workspace\InVEST-UrbanFloodRiskMitigation-log-2020-04-07–16\_30\_44.txt  
2020-04-07 16:30:44,674 model.\_logged\_target(1642) Level 100 Starting model with parameters:  
Arguments for InVEST natcap.invest.urban\_flood\_risk\_mitigation 3.8.0:  
aoi\_watersheds\_path C:/ESRI/GISDATA/Dakotas/BigSioux/hydrography/huc04\_bs.shp  
built\_infrastructure\_vector\_path  
curve\_number\_table\_path C:/InVEST\_3.7.0\_x86/seasonal\_water\_yield/curvenumber.csv  
infrastructure\_damage\_loss\_table\_path  
lulc\_path C:/ESRI/GISDATA/Dakotas/BigSioux/LULC/nlcd2016utm.tif  
n\_workers -1  
rainfall\_depth 25  
results\_suffix 1  
soils\_hydrological\_group\_raster\_path C:/ESRI/GISDATA/Dakotas/BigSioux/Soils/HSG\_utm.tif  
workspace\_dir C:\Users\KBLANN\Documents\urban\_flood\_risk\_mitigation\_workspace

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2020-04-07 16:38:27,793 geoprocessing.align\_and\_resize\_raster\_stack(752) INFO 1 of 2 aligned: aligned\_lulc\_1.tif  
2020-04-07 16:38:32,885 geoprocessing.logger\_callback(3239) INFO Warp 63.0% complete C:\Users\KBLANN\Documents\urban\_flood\_risk\_mitigation\_workspace\temp\_working\_dir\_not\_for\_humans\aligned\_soils\_hydrological\_group\_1.tif  
2020-04-07 16:38:35,540 geoprocessing.logger\_callback(3239) INFO Warp 100.0% complete C:\Users\KBLANN\Documents\urban\_flood\_risk\_mitigation\_workspace\temp\_working\_dir\_not\_for\_humans\aligned\_soils\_hydrological\_group\_1.tif  
2020-04-07 16:38:36,012 geoprocessing.align\_and\_resize\_raster\_stack(752) INFO 2 of 2 aligned: aligned\_soils\_hydrological\_group\_1.tif  
2020-04-07 16:38:36,012 geoprocessing.align\_and\_resize\_raster\_stack(754) INFO aligned all 2 rasters.  
2020-04-07 16:38:36,078 geoprocessing.raster\_calculator(375) INFO starting stats\_worker  
2020-04-07 16:38:36,078 geoprocessing.raster\_calculator(381) INFO started stats\_worker \<Thread(Thread-2, started daemon 3040)\>  
2020-04-07 16:38:36,094 threading.run(870) DEBUG payload is None, terminating  
2020-04-07 16:38:36,094 geoprocessing.raster\_calculator(486) INFO Waiting for raster stats worker result.  
2020-04-07 16:38:36,094 threading.run(870) WARNING No valid pixels were received, sending None.  
2020-04-07 16:38:36,094 Task.add\_task(641) ERROR Something went wrong when adding task create cn raster (1), terminating taskgraph.  
Traceback (most recent call last):  
File “site-packages\taskgraph\Task.py”, line 607, in add\_task  
File “site-packages\taskgraph\Task.py”, line 1071, in \_call  
File “site-packages\pygeoprocessing\geoprocessing.py”, line 424, in raster\_calculator  
File “site-packages\natcap\invest\urban\_flood\_risk\_mitigation.py”, line 816, in \_lu\_to\_cn\_op  
File “site-packages\scipy\sparse\_index.py”, line 35, in **getitem**  
File “site-packages\scipy\sparse\_index.py”, line 139, in \_validate\_indices  
File “site-packages\scipy\sparse\_index.py”, line 171, in \_asindices  
IndexError: index (128) out of range  
2020-04-07 16:38:36,094 model.\_logged\_target(1648) ERROR Exception while executing \<function execute at 0x0DF3A9C0\>  
Traceback (most recent call last):  
File “site-packages\natcap\invest\ui\model.py”, line 1645, in \_logged\_target  
File “site-packages\natcap\invest\urban\_flood\_risk\_mitigation.py”, line 250, in execute  
File “site-packages\taskgraph\Task.py”, line 607, in add\_task  
File “site-packages\taskgraph\Task.py”, line 1071, in \_call  
File “site-packages\pygeoprocessing\geoprocessing.py”, line 424, in raster\_calculator  
File “site-packages\natcap\invest\urban\_flood\_risk\_mitigation.py”, line 816, in \_lu\_to\_cn\_op  
File “site-packages\scipy\sparse\_index.py”, line 35, in **getitem**  
File “site-packages\scipy\sparse\_index.py”, line 139, in \_validate\_indices  
File “site-packages\scipy\sparse\_index.py”, line 171, in \_asindices  
IndexError: index (128) out of range  
2020-04-07 16:38:36,094 model.\_logged\_target(1651) INFO Execution finished  
2020-04-07 16:38:36,094 utils.prepare\_workspace(121) INFO Elapsed time: 7m 51.420000000000016s

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<div class="post-metadata">

**Author:** ![jdouglass](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.naturalcapitalalliance.org/jdouglass/32/9_2.png) [@jdouglass](https://community.naturalcapitalalliance.org/u/jdouglass)\
**Post date:** [April 8, 2020, 9:07pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-mitigation-indexerror-index-out-of-range/918/2 "2020-04-08T21:07:31Z")

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Hi @kblann, Based on the error, it looks like your landcover raster has some pixel values of 128, and the value of 128 isn’t in your Curve Number table (`curvenumber.csv`). This sometimes happens with signed byte rasters in ArcGIS, or else it’s possible that the nodata value of the raster is not set. Could you check that the nodata value is set to the correct pixel value?

Let us know if that doesn’t do the trick and we can keep troubleshooting!  
James

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<div class="post-metadata">

**Author:** ![kblann](https://avatars.discourse-cdn.com/v4/letter/k/67e7ee/32.png) [@kblann](https://community.naturalcapitalalliance.org/u/kblann)\
**Post date:** [April 9, 2020, 7:08pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-mitigation-indexerror-index-out-of-range/918/3 "2020-04-09T19:08:27Z")

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Thanks!

My raster attribute table did not indicate any pixel values of 128 and I wasn’t sure how to set the nodata value without seeing it in the table. So instead I added a “no data” row to my curve number table for pixel values of 128 (curve number 0 for all soil types). And that seemed to do the trick.

While I’ve got your “attention”, though–I’m sort of curious if you ever plan to add any flow accumulation / routing to this model, to model where the runoff is most likely to end up causing flooding? Thanks in advance…

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<div class="post-metadata">

**Author:** ![jdouglass](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.naturalcapitalalliance.org/jdouglass/32/9_2.png) [@jdouglass](https://community.naturalcapitalalliance.org/u/jdouglass)\
**Post date:** [April 9, 2020, 8:27pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-mitigation-indexerror-index-out-of-range/918/4 "2020-04-09T20:27:25Z")

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@kblann adding 0 for 128 sounds like a good workaround!

I’m not aware of any plans to add routing to Urban Flood Risk Mitigation at this time. Maybe @RafaSchmitt would be able to chime in here?

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**Author:** ![hcambridge](https://avatars.discourse-cdn.com/v4/letter/h/7c8e57/32.png) [@hcambridge](https://community.naturalcapitalalliance.org/u/hcambridge)\
**Post date:** [June 24, 2020, 10:59am UTC](https://community.naturalcapitalalliance.org/t/urban-flood-mitigation-indexerror-index-out-of-range/918/5 "2020-06-24T10:59:13Z")

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Hi  
I’m having the same problem with my Soil data in the UFM model.

**ValueError: invalid entry in choice array**  
**Check that the Soil Group raster does not contain values other than (1, 2, 3, 4)**

Analysis of my raster shows just two classes with NODATA set to 0. Values are Unsigned Integers. (UInt16).

Biophysical Parameters (lucode, CNs) as follows:

lucode,CN\_A,CN\_B,CN\_C,CN\_D  
0,30,30,30,30  
1,30,30,57,63  
2,30,30,74,85  
3,30,30,79,84  
4,30,30,85,89  
5,30,30,93,95  
6,30,30,47,55  
8,91,91,91,94  
9,90,90,90,92  
10,100,100,100,100  
11,100,100,100,100

Any other suggestions as to what I can do.  
Thanks

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<div class="post-metadata">

**Author:** ![dcdenu4](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.naturalcapitalalliance.org/dcdenu4/32/544_2.png) [@dcdenu4](https://community.naturalcapitalalliance.org/u/dcdenu4)\
**Post date:** [June 24, 2020, 11:51am UTC](https://community.naturalcapitalalliance.org/t/urban-flood-mitigation-indexerror-index-out-of-range/918/6 "2020-06-24T11:51:40Z")

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Hi @hcambridge,

Thanks for posting with this issue. Do you think you could attach the logfile here? It would also be helpful if you could attach or share the soil group raster as well. Usually this error occurs because the soil raster has a rogue value outside of the { 1, 2, 3, 4 } set.

Best,

Doug

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<div class="post-metadata">

**Author:** ![hcambridge](https://avatars.discourse-cdn.com/v4/letter/h/7c8e57/32.png) [@hcambridge](https://community.naturalcapitalalliance.org/u/hcambridge)\
**Post date:** [June 24, 2020, 12:39pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-mitigation-indexerror-index-out-of-range/918/7 "2020-06-24T12:39:56Z")

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Thanks for taking a look.  
Howard

[InVEST-UrbanFloodRiskMitigation-log-2020-06-24–13\_35\_42.txt](https://community.naturalcapitalalliance.org/uploads/short-url/aMuT0d9R82JI1IxXkmUvqeeuSpW.txt) (19.8 KB)

[sdat\_1566\_1\_20200615\_090645355-NAKURU-reproj3.tif](https://community.naturalcapitalalliance.org/uploads/short-url/34PsrxhIjKFxu9HNA1Q23Y2CHq3.tif) (56.3 KB)

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<div class="post-metadata">

**Author:** ![dcdenu4](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.naturalcapitalalliance.org/dcdenu4/32/544_2.png) [@dcdenu4](https://community.naturalcapitalalliance.org/u/dcdenu4)\
**Post date:** [June 24, 2020, 1:49pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-mitigation-indexerror-index-out-of-range/918/8 "2020-06-24T13:49:59Z")

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Hi @hcambridge

I think you have the same issue as this user: [Urban Flood Risk Mitigation - Soil Group Raster preparation error? - #6 by dcdenu4](https://community.naturalcapitalalliance.org/t/urban-flood-risk-mitigation-soil-group-raster-preparation-error/1066/6).

> Sorry for the delay here. It looks like there is a bug that we’ll need to fix. In the meantime can you try setting the `nodata` value on your `Soilgroups_1_3_4` raster to something other than `0` ? Maybe `7` ?  
> Please try that with InVEST 3.8.4 and let me know if it works.

Could you also try this and report back?

Thanks,

Doug

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**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/naturalcapitalproject/original/2X/8/8d95591aa074da87ea0fdd61ca47c1c3c0588aa7.png) [@system](https://community.naturalcapitalalliance.org/u/system)\
**Post date:** [July 1, 2020, 1:50pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-mitigation-indexerror-index-out-of-range/918/9 "2020-07-01T13:50:06Z")

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Closed on July 1, 2020, 1:50pm UTC

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