Stream Power Index SPI calculation in ArcGIS (Detail Explanation)

[@carlosjosedossantosfreitas1500]

MUITO OBRIGADO, SUA EXPLICAÇÃO É PERFEITA!! AJUDOU UM ESTUDANTE BRASILEIRO

[@ExploreRSGISTutorials]

Thank you so much for watching...

[@hamdynabeih7094]

Nice effort, what is the source of the equation please?

[@gulshanverma7890]

Sir, can you please tell me that which method you used in calculating SPI.

[@rasu68]

Can I get the hand note please?

[@ViCtOrBization]

Congrats for your video. I'd have a question... why did you calculate slope from the filled dem instead of doing it with normal dem?

[@ExploreRSGISTutorials]

Thanks for your question sir, Sinks (and peaks) are often errors due to the resolution of the data or rounding of elevations to the nearest integer value. Sinks should be filled to ensure proper delineation of basins and streams. If the sinks are not filled, a derived drainage network may be discontinuous.

[@ViCtOrBization]

@@ExploreRSGISTutorials Agree. It seems though that filling tool is only used in hydrology. And I suppose that fill should be the main previous thing to do when people work with DEMs... thanks anyway for your answer

[@susmitabanerjee6173]

Which data you have used

[@a.oguzaltunel9686]

Why silent, you were just fine in TWI video. Do not worry about minor hiccups here and there. Videos will be much better with voice, and you will always get better.

[@ExploreRSGISTutorials]

Thanks a lot , I will consider this from next.

[@mrfaizi2450]

Why you use percent for slope onstead of degree..I HAVE RECENTLY CALCULTED TWI using degree

[@ExploreRSGISTutorials]

By using percentages, small differences are much easier to make clear.