---
title: "What are the units in aspect and slope added in sepal.io"
url: "https://openforis.support/questions/1408/what-are-the-units-in-aspect-and-slope-added-in-sepalio"
tags: ["sepal"]
status: "answered"
score: 0
answer_count: 1
asked: "2017-10-20T12:34:26"
last_activity: "2017-11-03T09:27:16"
source: "Open Foris Support - Q&A Forum"
license: "Copyright Open Foris, 2026. Some rights reserved under creative commons license."
---

# What are the units in aspect and slope added in sepal.io

Asked by flandsberg on 2017-10-20

Hi,

What are the units of the slope and aspects added to the csv in sepal.io?

Thanks,

Florence


## Answer (score 0, by yelena on 2017-11-03)

Link: https://openforis.support/questions/1408/what-are-the-units-in-aspect-and-slope-added-in-sepalio/1418

Hi Florence,

The stratified area estimator- design tool, accessible in [SEPAL][1], uses [SRTM][2] data to calculate elevation, slope and aspect. It calculates the slope and aspect in radians.

Best,

Yelena


  [1]: https://sepal.io/
  [2]: http://srtm.csi.cgiar.org/

> Thanks Yelena! Do you know if the input SRTM is 30 or 90 m resolution? Also, could the slope be in percent? It would be much easier to understand. Cheers, Florence (flandsberg)