GIS data capture and editing mean the identification, collection, digitization, and correction of errors for the data necessary in the building of a GIS database. This is the most expensive and critical phase in GIS setup. Building a GIS database could take up to 5-10 times the cost of hardware and software or 70-80% of the total cost.
The main sources of data for GIS are:
- Analog maps and plans;
- Digital RS images
- Surveying field notes
- Aerial photographs
- Tabular data g. census, rainfall, soils, etc.
- GPS receivers data
- Direct import from other GIS systems
- Existing digital data
When collecting data, collect only the data needed to provide for the information needs of users as determined from the user needs assessment. For cost-effectiveness, go for the minimum quality that will get the job done.