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GIS 热点分析错误
我在做热点分析时,提示:warning000853:默认邻域搜索阈值为45320.7595meters。
帮助里给的解决方案: 将计算出的距离用作建议的起始位置。针对 空间关系的概念化调整值或使用不同的选项,以确保各要素具有足够的邻域。 请问是什么问题?该怎么解决啊?多谢 PS:地理坐标系: GCS_Beijing_1954投影坐标系: Beijing_1954_3_Degree_GK_CM_108E |
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发布于:2016-04-05 12:23
The ESRI Spatial Statistics tools do not calculate great circle distance if the data is in a geographic coordinate system (Lat/Long). As such, distance based spatial analysis is incorrect. The tools require that your projection units be in feet or meters. The "ZONE_OF_INDIFFERENCE" is a term made up by ESRI that basically means that within a local neighborhood the values one or both sides of the equation are exhibiting identical values. You cannot fit a regression on a single value!
I feel obligated to point out that you should use GWR with great caution. There are several papers that have identified serious flaws with this method. You should also be aware of the original intent of GWR. It is specifically designed to address data that exhibits nonstationarity. This is a second order (local) autocorrelation effect whereas the Moran's-I statistic represents 1st order effects (global). If your data does not have any 2nd order effects the results of GWR will be quite incorrect. You can test this using one of the local autocorrelation tools (under Mapping Clusters). If you have spatial outliers with significant p values then GWR is appropriate, given its limitations. Spatial exploratory analysis is a critical step before applying a given regression approach. 参考这里:http://gis.stackexchange.com/questions/59283/what-do-arcgis-regression-analysis-warnings-000853-000916-000981-mean |
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