Multiple validations at the same location

Note: Supported only for vector datasets

For reasons of quality assurance and the application of approaches such as majority voting to the validation data set, having multiple validations at the same location is possible in LACO-Wiki. This can be implemented as follows:

1. Create an initial sample of any type, i.e., random, stratified, etc.

2. Download the created sample as a shapefile from LACO-Wiki.

3. Create a second sample using the augmentation option that has been added to LACO-Wiki (see Figure 20a). Load the shapefile (see Figure 20b) downloaded in step 2.

4. Repeat step 3 to create the number of sample sets that correspond to the number of times you want a location to be validated.

Figure 20a: The augmentation feature in LACO-Wiki

Figure 20b: Uploading a sample through the augmentation feature

The process outlined above produces multiple samples of the same data set. These are then turned into multiple validation sessions that are assigned to (or shared with) different individuals, who then carry out the validation. Accuracy reports can be created for each validation session so that the results can be compared across individuals or the raw data can be downloaded to produce a combined validation data set (using external software such as a GIS package, Excel, R, etc.).