![CSP/ERGo/1_0/Global/SRTM_topoDiversity](https://developers.google.com/earth-engine/datasets/images/CSP/CSP_ERGo_1_0_Global_SRTM_topoDiversity_sample.png)

Dataset Availability
:   2006-01-24T00:00:00Z--2011-05-13T00:00:00Z

Dataset Producer
:


    [Conservation Science Partners](https://www.csp-inc.org/)

Tags
:
    [aspect](https://developers.google.com/earth-engine/datasets/tags/aspect) [csp](https://developers.google.com/earth-engine/datasets/tags/csp) [elevation](https://developers.google.com/earth-engine/datasets/tags/elevation) [elevation-topography](https://developers.google.com/earth-engine/datasets/tags/elevation-topography) [ergo](https://developers.google.com/earth-engine/datasets/tags/ergo) [geophysical](https://developers.google.com/earth-engine/datasets/tags/geophysical) [global](https://developers.google.com/earth-engine/datasets/tags/global) [landforms](https://developers.google.com/earth-engine/datasets/tags/landforms) [slope](https://developers.google.com/earth-engine/datasets/tags/slope) [topography](https://developers.google.com/earth-engine/datasets/tags/topography)

#### Description

Topographic diversity (D) is a surrogate variable that represents the
variety of temperature and moisture conditions available to species as local
habitats. It expresses the logic that a higher variety of topo-climate
niches should support higher diversity (especially plant) and support
species persistence given climatic change.

To calculate D, the multi-scale Topographic Position Index (mTPI), being a
dominant control of soil moisture (T), was used for measuring hillslope
position. The mTPI was combined with the square-root transform for
mTPI\>0 (T') and with the standard deviation of the Continuous
Heat-Insolation Load Index (CHILI), calculated at multiple scales (C') as:
D = 1 - ((1-T') \* (1-C'). It is based on the 30m SRTM DEM (available in EE
as USGS/SRTMGL1_003).

The Conservation Science Partners (CSP) Ecologically Relevant Geomorphology
(ERGo) Datasets, Landforms and Physiography contain detailed, multi-scale
data on landforms and physiographic (aka land facet) patterns. Although
there are many potential uses of these data, the original purpose for these
data was to develop an ecologically relevant classification and map of
landforms and physiographic classes that are suitable for climate adaptation
planning. Because there is large uncertainty associated with future climate
conditions and even more uncertainty around ecological responses, providing
information about what is unlikely to change offers a strong foundation for
managers to build robust climate adaptation plans. The quantification of
these features of the landscape is sensitive to the resolution, so we
provide the highest resolution possible given the extent and characteristics
of a given index.

### Bands

**Bands**

Pixel size: 270 meters (all bands)

| Name | Min | Max | Pixel Size | Description |
|---|---|---|---|---|
| `constant` | -1323.63\* | 8.81\* | 270 meters | SRTM-derived topographic diversity |

\* estimated min or max value

### Terms of Use

**Terms of Use**

[CC-BY-NC-SA-4.0](https://spdx.org/licenses/CC-BY-NC-SA-4.0.html)

### Citations

Citations:

- Theobald, D. M., Harrison-Atlas, D., Monahan, W. B., \& Albano, C. M.
  (2015). Ecologically-relevant maps of landforms and physiographic diversity
  for climate adaptation planning. PloS one, 10(12),
  [e0143619](https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0143619)

### Explore with Earth Engine

> [!NOTE]
> **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)

### Code Editor (JavaScript)

```javascript
var dataset = ee.Image('CSP/ERGo/1_0/Global/SRTM_topoDiversity');
var srtmTopographicDiversity = dataset.select('constant');
var srtmTopographicDiversityVis = {
  min: 0.0,
  max: 1.0,
};
Map.setCenter(-111.313, 39.724, 6);
Map.addLayer(
    srtmTopographicDiversity, srtmTopographicDiversityVis,
    'SRTM Topographic Diversity');
```
[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/CSP/CSP_ERGo_1_0_Global_SRTM_topoDiversity) [Global SRTM Topographic Diversity](https://developers.google.com/earth-engine/datasets/catalog/CSP_ERGo_1_0_Global_SRTM_topoDiversity) Topographic diversity (D) is a surrogate variable that represents the variety of temperature and moisture conditions available to species as local habitats. It expresses the logic that a higher variety of topo-climate niches should support higher diversity (especially plant) and support species persistence given climatic change. To calculate D, the ... CSP/ERGo/1_0/Global/SRTM_topoDiversity, aspect,csp,elevation,elevation-topography,ergo,geophysical,global,landforms,slope,topography 2006-01-24T00:00:00Z/2011-05-13T00:00:00Z -90 -180 90 180 Google Earth Engine https://developers.google.com/earth-engine/datasets

- [](https://doi.org/https://www.csp-inc.org/)
- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/CSP_ERGo_1_0_Global_SRTM_topoDiversity)