Sidwell has the equipment and software necessary to offer a wide variety of photogrammetric services and to complete your project from aerial acquisition through digital orthophotography. Using our extensive experience, we maintain careful control over the processes, assure product accuracy, and keep costs down. Sidwell’s staff of experienced technicians and certified licensed professionals has the industry expertise necessary to deliver superior products and services to your organization that are completed on time and under budget. Please use the links below to browse more information about Sidwell’s Photogrammetric Services.
Aerial Photo Acquisition
Aerial imagery forms the foundation for accurate measurements to assist the project manager in need of land use, physical features, surface models, and volumetric data.
Some common application include:
♦ Land use studies
♦ Vegetation analysis
♦ Large scale wall displays
♦ Court exhibits
♦ Customized maps
Aerial photography can be provided to you as a hard copy or digital product that is ready to be viewed using standard software. Sidwell also maintains a large film library to meet your needs for commercial imagery or historical data.
Planimetric / Topographic Data
Photogrammetric surveys provide an efficient and cost-effective means of developing topographic mapping for your project.
Any project involving design and construction requires current and accurate surface mapping. Photogrammetric surveys provide an efficient and cost-effective means of developing topographic mapping for your project.
Common applications include:
♦ Engineering and design
♦ Cut/Fill calculations
♦ Stormwater management
♦ Impervious surface determination
♦ ALTA surveys
♦ FIRM updates
♦ Volumetric computations
Following our quality control procedures, data is delivered as plotted maps or in MicroStation, AutoCAD, Esri, and other popular digital formats or paper/mylar plots.
Sidwell’s knowledge of principles and practices in photogrammetry is complemented with the use of the latest technologies and equipment.
Sidwell’s technicians’ knowledge of principles and practices in photogrammetry is complemented with the use of all industry standard equipment including Airborne Global Positioning System (AGPS), flight management software, softcopy photogrammetry systems and stereoplotters.
Unlike our competitors, the entire orthophotography production process takes place at our production facility in St. Charles, Illinois. Through stereoscopic measurement and autocorrelation processing of the photography, a digital elevation model (DEM) is produced, resulting in a grid of points defining the shape of the earth’s surface. The image scans, ground control and DEM data are combined via software to “wrap” the perspective photo onto the DEM data. Once the image is resampled, software is used to blend the images together to form a continuous, seamless image. The resulting orthographically correct imagery can be provided digitally for viewing at various scales, or plotted on film or paper at a scale suitable for your project.
Sidwell uses LiDAR technology for large projects that require information quickly and for areas that are inaccessible or difficult to measure using other methods.
Light Detection and Ranging (LiDAR) is a laser system that sends out narrow pulses or beams of lights. The returning light is then counted and processed by a receiver.
LiDAR in an aerial platform collects information that defines the surface of the earth by sweeping back and forth as the aircraft is in motion. The resulting point data forms a surface model showing the heights of all buildings and other objects on the ground, as well as a bare earth surface. The bare earth data set can be used to support the production of digital orthophotography or contours.
Sidwell uses LiDAR technology for large projects that require information quickly and for areas that are inaccessible or difficult to measure using other methods. LiDAR can also penetrate tree and vegetation cover. It is unaffected by sunlight or temperature, making it possible to collect data at night.