My data is in two different cities and three different EPSG code area. (Database is PostgreSQL/PostGIS.)
- So I think, I can not set SRID values by data. Making 3 different table is difficult. How can I do it?
- Data will be collected with high accuracy GPS devices. It is also difficult to change coordinates in city borders.
If I use global EPSG:3857 for all data, the calculation of length will be different from actual collected data data. How can I solve this problem?