4.3 ISPRS test data
The ISPRS maintains a set of LiDAR test data used for testing ground filtering algorithms. The data come from different test sites including both city and forest. The data used in this test are from Site 5 (vegetation on a steep slope). The aim of the test was to determine how well the algorithm performs in extreme conditions (e.g., the presence of gaps in the data). ISPRS test data were used because the data set was specifically designed for testing algorithms and comes with reference data.