![]() ![]() Ask for an uncompressed or lossless image in addition to any lossy, compressed images they provide. This can make it difficult to precisely locate features on the map, since edges may spread out over several pixels. One drawback of image compression, especially the wavelet compression used by MrSID imagery, is that it can produce ringing artifacts around the edges of features. ![]() Orthoimages are large files, and you may receive a file that has been compressed to reduce its file size. In addition to ExpertGPS, TopoGrafix offers EasyGPS, a free GPS data viewer. Have a question about ExpertGPS, or need help with a GPS or data conversion If your question isnt answered in these Step-by-step Tutorials, or in the ExpertGPS Help File, use the form below and Ill walk you through a solution. ![]() Your contract with the imagery provider should specify the level of accuracy to expect across the entire image. Since 1998, TopoGrafix has been dedicated to creating high-quality, easy-to-use GPS map software products for the outdoor recreation, geocaching, and professional markets. Im Here to Help with your ExpertGPS and Data-Conversion Questions. They will also add the georeferencing data, the calibration points that allow ExpertGPS to determine the latitude and longitude of every pixel on the image. 1) Set up a working directory and make a copies of the. Overhead imagery needs to be ortho-rectified by the imagery provider to remove the distortion caused by the aerial camera not pointing straight down when the photo is taken. SHORT COURSE - PREPARING AIRPHOTOS USING GPS, EXPERTGPS, EXCEL, AND FIELDLOG/AUTOCAD MAP. The accuracy you get in ExpertGPS depends on the quality of the ortho-rectification done by the imagery provider and the correctness of the calibration points (tie points) given in the GeoTIFF or. Read the full review of ExpertGPS at http://expertgps. If they don’t, there are free programs to extract a. ExpertGPS is a GPS map program for planning outdoor adventures. tfw calibration file with the GeoTIFF – this would be standard if they were providing imagery for use in ArcGIS, so they should be used to it. It should be relatively painless for the consultant or the imagery provider to also provide a. ExpertGPS will treat it as an uncalibrated TIFF, meaning you’ll have to do the calibration by hand. Last but not least…when importing an image to ExpertGPS what format would yield the absolute best accuracy we could hope for? How to use GeoTIFF imagery in ExpertGPS?ĮxpertGPS doesn’t have the ability to read the projection and georeferencing data out of a GeoTIFF at this time, although it’s high on my list of to-do features for GIS users. My question to you is does ExpertGPS software support the beforementioned format and or if there is a better format to employ in your opinion.Īs a backup thought I have requested we receive the image in various formats to make sure all of our software would be compatible with it…. Software maintenance is optional, and you can cancel at any time and continue using the software and maps you have, without access to support, the ExpertGPS map servers, and some online features like address geocoding.The District is considering the purchase of a new GEOTIFF aerial image of the district boundaries for mapping of the infrastructure…the consultant we have been in contact with is advising us to purchase the image in this format for its exceptional horizontal accuracy. After 12 months, you will continue receiving program updates, technical support, and access to high-resolution map downloads for an annual maintenance fee of $79 per user for Pro licenses, or $33 for Home licenses. Our secure servers areĪvailable to take your order 24 hours a day.ĮxpertGPS comes with free access to all program updates, high-resolution maps and aerial photos, and priority technical support for 12 months. After placing your order you will receive an unlock code via e-mail within minutes. Upgrade your existing ExpertGPS Home license to ExpertGPS ProĮxpertGPS features instant activation for your convenience. View GPS waypoints and tracklogs from any handheld GPS receiver over aerial photos and US topographic maps. Read the full list of differences between ExpertGPS Pro and ExpertGPS Home ExpertGPS is the ultimate GPS map software for planning outdoor adventures. Whether you’re discovering a new trail or scouting a 400. Disconnect your laptop and head out on a trip, and all of your data is available. ExpertGPS downloads aerial photos and topo maps for any location in the US, saving the maps to your hard drive. The demo version of ExpertGPS contains all of the features in ExpertGPS Pro. With ExpertGPS, you’ll be able to calculate acreage, measure distance, elevation and grade. ![]()
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