Esri managing elevation documentation error for creating mosaic datasets has the metadata field names reversed LE90 and CD90

333
1
04-12-2023 09:00 AM
BillFox
MVP Frequent Contributor

Esri managing elevation documentation error for creating mosaic datasets has the metadata field names reversed LE90 and CD90

This esri document about creating mosaic datasets metadata reversed the field names LE90 and CD90.

https://doc.arcgis.com/en/imagery/workflows/managing-elevation/workflow/workflow-creating-mosaic-dat...

Compared to this other esri document

https://desktop.arcgis.com/en/arcmap/latest/manage-data/raster-and-images/wkflw-elevation-part1.htm

I submitted a correction request to esri support for the documentation and they said it will be revised in the document in the next version.

Accuracy of elevation measurements

There are two common values associated with remotely sensed data and mapping to define the accuracy of the data: circular error and linear error. Horizontal spatial accuracy is the circular error of a dataset's horizontal coordinates at a specified percentage level of confidence. Vertical spatial accuracy is defined by the linear error of a dataset's vertical coordinate at a specified percentage of confidence, such as an elevation measurement. Basically, accuracy is measured by the probability distribution that a value has from the true value. An accuracy of 90 percent confidence level means that 90 percent of positional accuracies will be equal to or smaller than the reported accuracy value.
You may see items in the metadata, such as CE90; this signifies that it is a measure of circular error of 90 percent and will often have a value associated with it, whereas LE90 signifies a linear error of 90 percent. You may also see VE for vertical error (which is linear error in a vertical direction). For example, SRTM data is often reported as having VE90 = 16 meters, meaning that 10 percent of the vertical measurement may deviate by greater than 16 meters from the correct vertical measurement at a point (considering latitude, longitude, and height inaccuracies).

0 Kudos
1 Reply
MaddeVoas
Esri Contributor

Hello @BillFox, this was brought to my attention and will be resolved in the next version of the Imagery Workflows website. Thank you so much for submitting the correction request and notifying the Imagery and Remote Sensing Esri Community on this matter.

0 Kudos