What if my county has an existing high accuracy digital terrain model? How will this impact the creation of contours from new ortho imagery?
The original high accuracy DTM is suitable for creation of 2’ and 10’ contours in the 1″=100’ and 1″=400’ areas respectively. These specifications meet ASPRS class 1 standards, the highest vertical standard. The contractor will use an existing high accuracy DTM where applicable and add supplemental mass points to account for surface changes. The new DTM will remain suitable for creation of 2’ and 10’ contours, but in areas that have changed the DTM will meet ASPRS class II accuracy standards.
Related Questions
- What if my county has an existing high accuracy digital terrain model? How will this impact the creation of contours from new ortho imagery?
- Will the State use the existing Digital Terrain Model (DTM) created from the original statewide production effort in the ortho pilot program?
- What is the digital terrain model (DTM)?
