Topographic survey data
Crude overview
Topographic overview data is generally based upon the notes of surveyors. They may determine naming and social data from other nearby sources (for instance, limit depiction might be gotten from neighborhood cadastral mapping). While of verifiable interest, these field notes intrinsically incorporate mistakes and inconsistencies that later stages in guide creation resolve.
Remote detecting information
Similarly as with field notes, remote detecting information (elevated and satellite photography, for instance), is crude and uninterpreted. It might contain gaps (because of overcast spread for instance) or irregularities (because of the planning of particular picture catches). Most cutting edge topographic mapping incorporates a vast segment of remotely detected information in its accumulation procedure.
