Tim Osborn

GPS Expert
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About Tim Osborn

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  1. For background maps (e.g. topographic) and aerial photos to automatically download and display you'll need to use the full-featured sister application ExpertGPS.
  2. Most likely EasyGPS and your 72H are displaying the same locations, but in different coordinate formats. This is a common source of confusion for many. Take a look at the following information which is the standard reply in such situations. Most problems involving GPS and map coordinate mis-matches are due to choosing the incorrect coordinate format and datum at some point in the process. If you are entering GPS coordinates by hand into ExpertGPS or EasyGPS from a book or a Web page, you need to ensure that you've selected the same coordinate format and datum that the source's author used, or position errors will occur. There are four main types of coordinate formats used throughout the world today: lat/lon, UTM, US State Plane, and National Grids. Lat/lon coordinates: There are three different ways to express latitude and longitude: 1. decimal degrees. (42.12345°N, -71.23456°W) Note that there are no spaces in these coordinates. 2. degrees and minutes (42° 23.456'N, -71° 43.632'W) Marine, aviation, and geocaching coordinates are usually given in deg min.min format. Note that there is a space between the degrees (°) and the minutes (') part of the coordinates. 3. degrees, minutes, and seconds. (42° 34' 54.234"N, -71° 24' 14.234"W) Civil survey and some marine waypoints are given in this format. Note that there are three parts to each coordinate, separated by spaces, and that three symbols are used to show the degrees, minutes, and seconds (° ' "). UTM coordinates Universal Transverse Mercator (UTM) coordinates are used worldwide. Unlike lat/lon, which is a spherical coordinate system based on angles, UTM, state plane, and national grid coordinates are rectangular grid systems where coordinates are expressed as Northings and Eastings from a fixed reference point. Rectangular grids make it much easier to calculate distances and to plot locations on a rectangular map. UTM coordinates look like this: 2346212N, 12343523E, 18T. The first value is the Northing. The second is the Easting. The third value (always a number between 1 and 60 followed by a single letter) is the UTM zone identifier. If your data is in UTM coordinates, it is very likely in NAD27 datum or WGS84 datum (see below). The vast majority of UTM data is expressed in meters. If you are using UTM data collected prior to 1983 by a US state entity, there's a chance that it uses US Survey Feet rather than meters as the base unit. ExpertGPS Pro provides an option for UTM coordinates in feet. US State Plane Coordinates Almost all of the data available from US state government Web sites is expressed in the US State Plane Coordinate System. US SPCS coordinates have two values, a Northing and an Easting. Some US states have only a single SPCS zone. Other states have a handful, broken down by county. You'll need to know which zone is in use, and select the correct one in ExpertGPS Pro. The ExpertGPS Web site lists the counties in every US state, and the appropriate SPCS zone to use: http://www.expertgps.com/spcs/default.asp National Grids Outside of the United States, many countries have their own National Grid coordinate systems. Many of these use the same Northing, Easting format described above. ExpertGPS lists the national grids for each country in the Add Coordinate Format dialog. To add a coordinate format in ExpertGPS, click Preferences on the Edit menu, and click on the My Coordinate Formats tab. Click Add. The Add Coordinate Format dialog will appear. On the left is an expandable list of all of the continents, countries, and US states. As you expand the location tree, ExpertGPS will show the coordinate formats used in that region on the right side of the dialog. Drill-down in the location side as far as you need to go to see the coordinate format for your location. Select the coordinate format, and then choose the appropriate datum from the list below. In the United States, you have two main datum choices: NAD27, and NAD83/WGS84. NAD27 was used from 1927 up until 1983, when it was replaced by NAD83 and WGS84. You can consider NAD83 and WGS84 to be identical in the 50 United States. For other areas of the world, ExpertGPS will display the datums used in that region. Select the correct datum from the list. You can add many different coordinate formats to ExpertGPS, and switch between them at any time to enter data or convert data to another format. ExpertGPS Pro users should keep in mind that the currently-active coordinate format is used whenever you import and export data. For more information on datums and coordinate formats in ExpertGPS, visit these Web pages: http://www.expertgps.com/help/why-dont-my-coordinates-match.asp http://www.expertgps.com/help/dlg-edit-coordinates.asp http://www.expertgps.com/spcs/default.asp
  3. I looked at the metadata for a couple of the GIS datasets (Conserved Lands, Parcels) at the Maine Office of GIS website. It looks to me like they are in meters, not US Survey Feet. Why don't you try UTM Zone 19, NAD83, Meters and see if that works.
  4. Carl: Yes, I think so. My mistake. Tim
  5. I'd suggest you try it again. It may have been that at the time you ran into trouble, the map server was having problems. I went to the area you show above and was able to zoom in without problem.
  6. I'd double check that file. I tried loading it into Manifold GIS and, while it loaded, it was just a bunch of grayscale noise. I then tried loading the tif into Photoshop and just got an all black image.
  7. This was discussed here as recently as March 2016. See the following thread: ExpertGPS for Mac
  8. What version of ExpertGPS are you using? I'm using 5.73 and the Go To Address function works as it should for me.
  9. According to the World Coordinate Converter (twcc.fr/en/) that location in WGS-84 would be 64.28275950065716°N, 27.861328170075748°E.
  10. Shapefile is a bit of a misnomer....it is usually 3 or more files all with the same name but different extensions like .shp, .shx, .dbf, .prj, etc. You have a bunch of different shapefiles in the 649_56 folder. Don't know which one is of interest to you, but they have to be imported individually. You'll need to specify SWEREF99_TM as the coordinate system on import.
  11. Import the shapefile into ExpertGPS. Decide if you want a regular topo or aerial image displayed behind the shapefile data or, if not, turn background images off by selecting Map:Show White Background. You can also decide this in the next step. Then select File:Export Image. Adjust the Width and Height to incorporate your area of interest, decide what you want exported (Map Image, Data Overlays) and export the image with a calibration file. You've just created a raster image of your vector shapefile data. This raster image can easily be brought into ExpertGPS as a Scanned Map via the world file (calibration file) you created through the File:Add Scanned Paper or Digital Map... command.
  12. Select the track, right click, and select "Close Track." It will then have an area and a perimeter. To fill it, select it, right click, and select "Edit Track" and select or create a Type that has fill.
  13. To have your tracks appear different, each needs to be assigned a different "type." Select a track, right click on it, and select Edit Track. There you can assign a different Type or create a new Type, with unique color, pattern, width, etc.
  14. For showing background maps and aerial photos you need to be using ExpertGPS. EasyGPS doesn't have that capability. As to adjusting time tags, I don't have any experience with that. Maybe someone else can help you.
  15. Each line in a CSV file should represent one record, with the fields in each record separated by commas, tabs, etc. Like this: N40 10.225, W075 42.389 N40 09.937, W075 41.382 ... Your file is just one long record with many fields. Since it appear that all your latitudes are North, if you have a text editor that permits "special characters", you can change all occurances of N to CRLF N, where CRLF is carriage return, newline (ASCII code 13 followed by ASCII code 10), and save the file. This will break the one long record into multiple records. Reopen the file and delete the top blank line or type in field descriptions such as "Latitude", "Longitude". Then save and import into ExpertGPS.