I.F. Rooks - Services

I.F. Rooks and Associates, Inc.
106 N.W. Drane St.
Plant City, FL 33563
Phone:(813)752-2113 or (800)495-3240
Fax:(813)752-3102
info@ifrooks.com

	Aerial Photography Using our Zeiss TOP 6" precision mapping camera with gyro-stabilized camera suspension and forward motion compensation (FMC), we are able to obtain aerial photography. High altitude imagery is obtained with our Cessna Turbo TU-206 aircraft. Additionally, we routinely provide low altitude imagery utilizing a Hughes 500 helicopter. Using Softcopy photogrammetric work stations, hundreds of photographs are merged into a single digital image.
	Helicopter Mapping Beginning in 1999, in response to traffic related injuries and the continued need for design-quality survey information on our congested roadways, I.F. Rooks (IFR) began providing Low Altitude (Helicopter) mapping to the DOT and consultant community. Click here to see our Helicopter Brochure.
	Topographic and Planimetric Mapping All Topographic mapping is compiled in either AutoCAD or Microstation, and delivered in a variety of digital vector file formats including DWG, DGN, and DXF. In addition, break line and post data is available for use with DTM modeling software. This data can be supplied in formats compatible with programs like Terramodel or in ASCII files that can be read by other civil engineering programs. The Florida Department Of Transportation requires very specific formats for roadway projects. We have considerable experience providing this class of data, specifically Microstation files and ASCII files tailored to the CAICE and GEOPAK software formats.
	Digital Orthophotos A digital orthophoto is a raster file in which the image has been converted from a perspective projection to an orthographic projection. The relief displacement inherant in a perspective projection has been corrected. A digital elevation model (DEM) is required to produce a digital orthophoto. The DEM is a grid of surface elevations. In some systems, the DEM is a grid of surface elevations plus break lines, which are 3-D lines at breaks in the terrain, such as ditch tops and other valleys and ridges. While this DEM data can be collected from field surveys, the most economical procedure turns out to be photogrammetric mapping. Rectified digital imagery is relatively inexpensive. Digital orthophotos are both labor and machine intensive, and consequently expensive to produce. If an image is to be used for display or promotional purposes, accuracy considerations are not of primary importance and rectified digital imagery will suffice. However, if the photo is to be used for map or design purposes then accuracy is of prime importance, and the additional cost of producing an orthophoto is probably warranted.
	Analytical Aerotriangulation The first step in our photogrammetry process is analytical aerotriangulation (AT). Our AT software enhances the ground control with the generation of additional analytic points. This enables us to verify the ground control as well as set up the project for mapping. If Airborne GPS is utilized it is incorporated in the process. The tolerances of the AT program are dependent on map scale and surpass the National Map Accuracy Standards.
	Stereocompilation Photogrammetric data is then compiled on our analytical stereo plotters or soft copy stereo plotters. All stereocompilation systems are currently calibrated and operated/overseen by experienced (15 + Years) stereocompilers, who orient the systems and photogrammetrically compile feature point data in three dimensions from parallax-cleared stereomodels of the aerial imagery. The stereocompilers rigorously adhere to the project specifications, particularly in regard to the feature detail to be collected and the project accuracy requirements. Our photography ranges from a scale of 1”=50' to 1”=2500’ with accuracies of .03’ to 2’ depending on altitude. In order to provide our clients with superior quality aerial photogrammetry and mapping products we are continually upgrading our technology to meet this demand.
	Editing The final phase of an aerial mapping project is editing. Our expert CADD/Edit department combines and edits the compiled mapping data. They break the project down into necessary sheet sizes and perform final quality control checks. Once a project has been edited it is translated into the client's specified format. All of our data and imagery, unless otherwise stated, are delivered on CD-ROM/DVD.