I want to learn how to overlay my Static GPS Points onto Quad Maps that show Section and Township corners, like Sinc did in this video:
http://www.quuxsoft.com/videos/XformGridToLDP.aspx
I guess the first hurdle would be where to find free Quad Maps and in what format does C3D work with them best. I asked this question on the Civil 3D Forum and was refered to this site:
http://viewer.nationalmap.gov/viewer/
I can't figure out how to grab an image. From blindly bumping around Google searches, I think I need a geo-referenced image file of some sort. If I can get that I might be able to figure out how to insert it at the right scale into Civil 3D.
Dave
SS,
Thanks for the link. Lots of info there, except the key piece of the puzzle I desperately desire: How to grab a geo-referenced image and put it on my computer.
Dave
All Topo
This is what I use Dave. It's not free but the basic version is very reasonably priced and extremely versatile. I use it for preparing plan of survey maps at work as well as hunting/adventure trips. Can export maps for CAD or import GPS data for plotting purposes. Can easily integrate with a recreational grade GPS on a laptop for real time navigation. Ton of surveying applications. Supports a wide variety of projections. I can custom stitch and scale USGS quad maps for a particular project or adventure. I can go on and on. Map sets of individual states sold separately. PLS Tools for plotting aliquot parts could be real handy if you did a lot of that kind of thing.
Curious if any other fans out there.
Just because I'm paranoid, doesn't mean they aren't out to get me.
Dave,
I originally was going to point you to the solution I use: Terrain Navigator Pro.
But, then I tried that map viewer link you posted. Very cool!
On the map, find your area of interest.
Then use the "Download Data" button.
Once the system has emailed you the ZIP file, extract it. It will have a bunch of files, the ortho image is a JPG file of considerable size.
In Civil3D, run the command MAPIINSERT.
Browse to the file.
You'll notice the image correlation box will show "correlation source: World file."
Don't mess with that setting. the world file is a text file that correlates the upper right and lower left of the image to a real world coordinate.
All Topo
:good: :good:
OK. Go here:
http://libremap.org/data/state/arizona/drg/
download the .tif AND the .tfw
then watch this:
Hope this helps.
SS
Sometimes necessary to mess with the world file if imagery is projected in meters (standard with a lot of aerial imagery) and you'd like it changed to US feet for your work.
Just because I'm paranoid, doesn't mean they aren't out to get me.
All Topo
Willy,
Get outa here! Mark Silver sells this?! I might have to whip out my credit card today. Thank you.
Dave
Darn metric! 🙂 :good:
Craig,
Thanks for the nice, clear instructions. I tried the bounding box in one of my attempts, but I don't remember it allowing me to choose OrthoImagery. I'll play with that again. Thank you.
Dave
Dave, you're welcome. I'm glad to help, and I appreciate you showing us that USGS free data source! I had no idea! 🙂
Thanks, SS. I watched Eric Colburn's video yesterday, and he lays things out well, but you still need the geo-referenced image file before you can insert it. That's where I'm stuck. The LibreMap link might just be what I need. Thank you.
Dave
Damn Metric, indeed, Craig. That was the key piece of info I needed. When my bounded image got e-mailed to me, one of the files was an XML file that gave the Metadata for the image -- UTM, Zone 11, Meters. Then my points fit the image nicely. Success! Thanks again for your help.
Dave