Gmap4 = Google Maps + topographic maps + more

Joseph

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Dear Moderators,

If you are concerned that this post is spam, please take a moment to see what people on other forums are saying about Gmap4. You will find links to a number of threads if you scroll down a bit on this page: http://www.mappingsupport.com/p/gmap4_links.html

Gmap4 is an enhanced Google Map viewer that lets you view detailed topographic maps for the USA and Canada. It is 100% free, has no ads and runs full screen. Since Gmap4 runs online, there is nothing to download or install.

Gmap4 lets you:
* Search
* Print
* Display a UTM grid
* Get the current magnetic declination
* Display data from GPX, KML, KMZ and TPO files
* Display data from a simple delimited file
* And more

Here is the Gmap4 homepage where you will find new user info, examples, a Help pdf file and a bit about me: http://www.mappingsupport.com/p/gmap4.html

Finally, for those that are following the flooding on the Missouri River, you can click the gauge symbols on the following map and you will get links to the current and forecast flows.
The dam symbols are linked to the current spill rate.

http://www.mappingsupport.com/p/gmap4.php?...=6&label=on

Enjoy!
Joseph, Gmap4 author
 

ilovesprig

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Welcome Joseph................................... :smiley_welcome_sign:


I used TOFer Paul C's Garmin 72 in New Mexico. It was one the the best tools I had (showing NF boundaries)................I had never really used a GPS before (well, MCC requires one, but I don't count that............. :lol: ) so all help is appreciated................... :2:
 

Joseph

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Thanks for the kind words.

The short answer is I wrote Gmap4 because I like maps, I enjoy helping people and I had the technical wherewithal.

A bit longer answer is that I wanted to improve the quality of trip report (TR) maps I was seeing in a forum for people that hike in the Pacific Northwest. People would commonly post a static jpg of some topo map and their GPS track. Of course those jpgs did not let you zoom, pan, change to the aerial view, etc. Since I already had done some programming with the Application Program Interface (API) for Google Maps, I knew that with a bit of work I could build a tool that would jazz up by own TRs and which hopefully others would also find useful.
 

Joseph

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No, Gmap4 does not have any special wizardry to show land ownership.

However, take a look at this map which shows an area NE of Alamogordo, NM. http://www.mappingsupport.com/p/gmap4.php?...p;t=t2&z=13
You can see the red national forest boundary line. Now zoom in a tick and notice the fine black boundary lines inside the NF. I believe those lines indicate private property within the NF boundary.

Also on this map, note that the MyTopo map is much better quality and more current than the US Topo map. The maps that I am calling US Topo are the Microsoft Terraserver maps (now renamed to Microsoft Research Maps).
 

Joseph

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Here's another thought about getting land ownership data on maps.

The US Forest Service (?and BLM?) has produced lots of KML/KMZ files that show all kinds of things - including land ownership.
To find these files, search on the name of your favorite national forest + "geospatial data".

You can view those files with Google Earth - but GE does not include the nice topographic maps.

You can view some - but not all - of those files with Gmap4. Simply get the URL of the KML/KMZ file you want to view and enter this into your browser bar:
_http://www.mappingsupport.com/p/gmap4.php?q=http://URL_to_file_you_want_to_view

If you try to view one of those files with Gmap4 and get a mostly blank screen, then that file exceeds one (or more) size-related limitations imposed by Google. If you are interested, you can read about those limits here: http://code.google.com/apis/kml/documentat...apsSupport.html

If you are trying to display a KML/KMZ file that does not exceed the size limits but still will not display, then it likely has more than 1000 "total document-wide features". I started a thread on this point on the Google Maps developer forum and am getting some input from a Google staffer. Maybe a future update to Gmap4 will be able to read these bigger KML/KMZ files. If you are curious, here's the thread: http://groups.google.com/group/google-maps...2b58f104ba4066a
 

DKScott

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Dang. I can't get the images to load at work. I have Google maps and Google earth, but the map image portion of the GMap4 viewer is blank. The IT nazis around here are clever.

And it seemed like such a promising time waster too :(
 

breacher

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This is really good! Ive been messing around with it for the last hour at work..........
 

DKScott

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Joseph

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DK,

What browser and version are you using? If you are required to use IE6, that might explain things.

Gmap4 uses version 3 of the Google Maps API. Google did not include IE6 in the list of officially supported browsers for v3.
Thus, some v3 Google Map apps will work with IE6 and some will not.
 

DKScott

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QUOTE (Joseph @ Jul 5 2011, 11:33 AM) index.php?act=findpost&pid=327850
DK,

What browser and version are you using? If you are required to use IE6, that might explain things.

Gmap4 uses version 3 of the Google Maps API. Google did not include IE6 in the list of officially supported browsers for v3.
Thus, some v3 Google Map apps will work with IE6 and some will not.


Its IE7

I have another service we subscribe to (CoStar) that has a searchable map feature that doesn't work here either, but works fine at home, but then I also have CoreLogic/RealQuest and that map search feature works great. Google Maps and Google earh work fine too. The security on this network is substantial and sometimes there are annoying conflicts.

No worries. This is better done at home anyway.
 

Joseph

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This page http://code.google.com/apis/maps/faq.html#browsersupport
says:

"Which web browsers does the Google Maps JS API support?
The Google Maps JavaScript API supports the following web browsers:
Google Maps JavaScript API V3:
* IE 7.0+ (Windows)
* Firefox 3.0+ (Windows, Mac OS X, Linux)
* Safari 4+ (Mac OS X, iOS)
* Chrome (Windows, Mac OS X, Linux)
* Android
* BlackBerry 6
* Dolfin 2.0+ (Samsung Bada)"
 

Joseph

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QUOTE (karstic @ Jul 5 2011, 04:01 PM) index.php?act=findpost&pid=327927
Got any way to display orthophotoquads?


In broad strokes, there are possibly two options, neither of which is implemented presently in Gmap4.

1. If ortho-whatever-else maps are already chopped into tiles, hosted on a free service, and named/arranged with the same system used by Google, then it should be a simple matter to add those maps as just another optional view. Oh, and the tiles should use the same datum that Google uses.

2. Any image can be placed on the map as an overlay. Typical implementations just show you one image at a time. As you pan you will get to that edge of that image. An ortho should use the same datum used by Google and you would need to tell the app the coords for 2 opposing corners of the ortho.
 
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