The mTPI distinguishes ridge from valley forms. It is calculated using elevation data for each location subtracted by the mean elevation within a neighborhood. mTPI uses moving windows of radius (km): 115.8, 89.9, 35.5, 13.1, 5.6, 2.8, and 1.2. It is based on the 30m "AVE" band of JAXA's ALOS DEM (available in EE as JAXA/ALOS/AW3D30_V1_1).
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.
代码语言：javascript复制mTPI 区分山脊和山谷形式。它是使用每个位置的高程数据减去邻域内的平均高程来计算的。 mTPI 使用半径 (km) 的移动窗口：115.8、89.9、35.5、13.1、5.6、2.8 和 1.2。它基于 JAXA 的 ALOS DEM（在 EE 中作为 JAXA/ALOS/AW3D30_V1_1 可用）的 30m“AVE”频段。
保护科学合作伙伴 (CSP) 生态相关地貌学 (ERGo) 数据集、地貌和地貌包含有关地貌和地貌（又名土地面）模式的详细的多尺度数据。尽管这些数据有许多潜在用途，但这些数据的最初目的是开发适合气候适应规划的地貌和地貌类别的生态相关分类和地图。由于未来气候条件存在很大的不确定性，生态响应的不确定性甚至更大，因此提供有关不太可能发生变化的信息为管理者制定稳健的气候适应计划提供了坚实的基础。景观的这些特征的量化对分辨率很敏感，因此在给定指数的范围和特征的情况下，我们提供可能的最高分辨率。Dataset Availability
2006-01-24T00:00:00 - 2011-05-13T00:00:00
Dataset Provider
Conservation Science Partners
Collection Snippet
ee.Image("CSP/ERGo/1_0/Global/ALOS_mTPI")
Resolution
270 meters
Bands Table
Name | Description | Min* | Max* | Units |
|---|---|---|---|---|
AVE | ALOS-derived mTPI ranging from negative (valleys) to positive (ridges) values | -3758 | 10963 | Meters |
* = Values are estimated
数据引用：
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
代码：
代码语言：javascript复制var dataset = ee.Image('CSP/ERGo/1_0/Global/ALOS_mTPI');
var alosMtpi = dataset.select('AVE');
var alosMtpiVis = {
min: -200.0,
max: 200.0,
palette: ['0b1eff', '4be450', 'fffca4', 'ffa011', 'ff0000'],
};
Map.setCenter(-105.8636, 40.3439, 11);
Map.addLayer(alosMtpi, alosMtpiVis, 'ALOS mTPI');
