![]() ![]() 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. Your contract with the imagery provider should specify the level of accuracy to expect across the entire image. 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. 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. 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. If they don’t, there are free programs to extract a. 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…. kmz file to the /Garmin/CustomMaps folder on your GPS. ![]() ExpertGPS will create a tiled map set that can be displayed on your GPS receiver. Click Export, and change the file type to Google Earth KMZ. Import the newly edited GPX file to Garmin Connect Detailed Instructions. In ExpertGPS, click Export Image on the Map menu, and set the size of the map you want to export (keep it under 10,000 x 10,000 pixels). Tracking works with eitherĪ physical serial port, or a virtual COM port.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. Garmin GPX files can be edited ExpertGPS is the ultimate GPS map software for. Tracking works with any GPS receiver or GPS antenna that outputs NMEA data to a COM port. If your GPS isn't listed above, you can still use it as an input to the Tracking feature in ExpertGPS to create a moving-map display Lowrance chartplotters and fish finders that are compatible with ExpertGPSīryton Rider and Aero cycling computers are compatible with ExpertGPS Simrad chartplotters that are compatible with ExpertGPSī&G chartplotters that are compatible with ExpertGPS Magellan models that can transfer waypoints, routes, and tracks with ExpertGPSĬlick the model family name below to confirm that ExpertGPS supports your Magellan GPS receiver:ĮxpertGPS can map and exchange waypoint and track data between any of these chartplotters Lowrance GPS receivers, chartplotters and fishfinders that work with ExpertGPSĬlick the model family name below to confirm that ExpertGPS supports your Lowrance chart plotter, fish finder, or handheld GPS:Īll other Lowrance GPS receivers, GPS chartplotters, and fishfinders. Garmin GPS receivers that can upload and download GPS data with ExpertGPSĬlick the model family name below to confirm that ExpertGPS supports your Garmin GPS, fitness watch, fishfinder, or chartplotter:Īll other Garmin GPS receivers, fitness watches, chart-plotters, and fish-finders. All other areas are limited distribution. DNC, for areas in which the US is the prime charting authority, is unclassified. Click the manufacturer's name for exact details for your specific GPS model. The Digital Nautical Chart (DNC) is produced by the National Geospatial-Intelligence Agency (NGA) and is a vector-based digital product containing maritime significant features essential for safe marine navigation. Find your GPS on the ExpertGPS compatibility list.ĮxpertGPS lets you upload and download waypoints, routes, and tracklogs from hundreds of GPS models from Garmin, Magellan, Lowrance and other GPS manufacturers. ![]()
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