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Planimetric and Topographic Mapping
MJ Harden’s turnkey mapping services provide the accuracy to meet your planimetric/topographic mapping needs. Planimetric and topographic maps are compiled from aerial imagery and survey data, based on the specific requirements of your project. These requirements may include identifying and digitizing planimetric features such as structures, roads and hydrography down to details such as manhole covers or utility poles. Variations in the earth’s topographic relief may also be depicted with contour lines that show changes in elevation. Both of these types of vector-based maps have a variety of uses in engineering, planning, land management, governmental and other applications. Planimetric and topographic maps are also used extensively in geographic information systems (GIS), and MJH has developed proprietary tools for updating projects in GIS environments.
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| Planimetric maps (above left) and topographic maps (above right) provide vector detail matched to high-resolutions aerial imagery. |
Our skilled compilation operators have decades of photo interpretation experience and utilize a variety of specialized hardware and software tools.
MJ Harden has been using terrain model data to produce topographic maps for over two decades. The experience sets us apart and assures that your map
products meet nationally recognized standards for accuracy and completeness.
Orthorectified Imagery
Orthophotos are scale-accurate, horizontally corrected aerial images. Distortions caused from the earth’s surface and aircraft movement are removed.
The result is a scale-accurate image. Ortho imagery is used in many applications where precise visual reference is required, such as cadastral mapping
for GIS. A digital orthophoto allows the user to actually view features on the landscape, which may be otherwise difficult to discern in a vector-based
map (i.e. farmland vs. pasture vs. parkland).
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| Orthophotos are scale-accurate photo map images that have been corrected horizontally and vertically to account for variations in the terrain. Integrating aerial images with terrain models can cause distortions for elevated features such as bridges and overpasses. These distortions are removed during the orthophoto process. |
To create orthophoto, aerial images are captured and processed using precise geodetic ground control networks. Field-collected X-Y-Z coordinate data
is used to create an elevation model representing the relief of the terrain. This coordinate data is then used to rectify the image to its correct horizontal
and vertical geographic location. The end product is a scale-accurate, map-quality, continuous-tone raster image that accurately depicts the subject area.
Orthophoto images from MJ Harden are used for a variety of applications, including: engineering design, asset management, municipal and government maps.
GIS land base maps, right-of-way mapping, alignment mapping, and public and private land development.
Survey Services
Our experienced, professional survey team uses GPS technology to capture coordinate data for geodetic control networks used in mapping projects and for field
inventory surveys. GPS technology offers unsurpassed accuracy and speed in survey applications. MJ Harden uses dual- and single-frequency GPS receivers
and data collectors, which can be used in our planes or in the field. Our survey data is typically used in the production of digital maps, which are created using a
combination of aerial photography and field control. Survey information can also become an important component of a geodatabase.
Inventory Services
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Field Inventories are used in a variety of applications where quantitative information needs to be collected and/or calculated. MJ Harden can provide
field inventory services to meet your exact needs.
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Asset Inventories involve physically locating facility assets in the field such as gas meters, utility poles and fire hydrants, among others. This
inventory also involves recording attribute data related to objects in a database.
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Volume Inventories are done using a combination of field survey data and photogrammetric analysis of aerial imagery. Volumetric calculations are based
on the physical dimensions of a quantity of material, such as a large storage pile of coal, gravel or other bulk product above the ground, or a reserve
of unmined material in a quarry pit.
