Some guidelines have already been published by national administrations and associations (FEMA and ASPRS in the USA). In Europe no standards have been defined yet. Helica applies the relevant guidelines available to its remote sensing operations, establishing first - in agreement with the customer - the resolution and accuracy of the digital altimetric products. These can be either a DTM, TIN or maps with contour lines.

Helica is developing a standardisation plan for the preparation and verification procedures of control areas, based on application guidelines established by the NOAA Coastal Mapping Program.
These are the initial operating parameters defined (still under development):

Number of survey points: at least 30 points surveyed using DGPS, with a base station positioned within
   a 30km radius;
In areas where the cover is not homogeneous, such as vegetation cover and soil use, representative
   points for the main classes should be surveyed;
Z altimetric errors: control areas with a homogeneous flat surface, for example car parks
   and playing fields;
X&Y planimetric errors: definable on vertical structures which are visible on the processed data and points
   cloud, for example, electricity pylons and perimeter walls. These structures will be surveyed using DGPS
   after the collection and processing of the data, as agreed with the customer;
An accuracy Report using guidelines set out by the Federal Geographic Data Committee