Spatial data can be obtained from various soures.The collection of spatial data can be done from scratch by direct spatial-data acquisition techniques or indirectly, by making use of data collected by others already. This learning path will introduce you to these sources:
One major source of collecting spatial data is Aerial photographs and satellite remote sensing to map relatively large areas which is the next concept of our discussion.
Spatial data can also be collected through Terrestrial surveys which are used to supplement, update of existing data and for verification of data from aerial surveys and by satellite remote sensing.
Field surveys are a major source of collecting spatial data to check and collect supplementary information from field(s), which comes as our next concept of discussion.
The next major source of collecting spatial data for our discussion is Mobile GIS which provides the platform for integration of mapping, GIS and positioning to field users via the use of devices: hand-held and mobile devices.