HJW GeoSpatial Services

GPS/IMU Aerial Photography
Topographic/Planimetric Mapping
Aerial Triangulation
Orthophoto Production
LiDAR Services
GIS Integration/Analysis
Remote Sensing
Historic Aerial Photo Library
Close Range Photogrammetry
 
 

HJW Planimetric Collection Standards
These specifications are established with the assumption that the stated map scale is derived from aerial photography of the appropriate photo scale. In general, any feature which meets collection criteria, and whose least dimension at ground level exceeds 0.10” at map scale will be represented in our maps.

Small Scale Mapping
1”= 400’: Road and railroad centerlines, airport pavement, bridges, buildings including tanks and docks; drainage centerlines longer than 1” at map scale; dams, vegetated areas.

Medium Scale Mapping
1”= 200’: the above, plus: road edges, landmark fences, pipeways, individual trees.
1”= 100’: the above, plus: sidewalks, driveways, paths, slabs, fences, walls, swimming pools, large surface planimetry (such as poles and billboards), railroads (both tracks), large utilities such as manholes, lights and electrical equipment, drain edges, channels, golf courses, orchards, marsh areas.

Large Scale Mapping
1”= 40’ and 1”= 50’: the above, plus: Gutters, paved walkways, street furniture, small surface planimetry such as posts and pole anchors, small utilities such as vaults and boxes.
1”= 20’: the above, plus: pavement paint and legends, stairs.

 

HomeAbout HJWServicesExperienceNewsClient EntranceContact Us
©2005 HJW GeoSpatial, Inc.