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Gmap4 - An enhanced Google Map viewer

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Offline Jelf

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Re: Gmap4 - An enhanced Google Map viewer
« Reply #30 on: January 29, 2012, 01:36:44 PM »
The Gmap4 code has been updated to version 3.0.  There are two new ‘big’ features that many people will find useful.

First, Gmap4 can now display a new set of very high resolution USA topographic maps that (1) are a better quality image than the MyTopo maps, (2) do not have heavy watermarks obscuring part of the map and (3) do not have any ads.  The link below displays a basic map of the USA.  Zoom in to your favorite area (or use the ‘Search’ feature) then open the menu in the upper right corner and select “t4 Topo High”.
http://www.mappingsupport.com/p/gmap4.php?ll=37.125286,-94.21875&t=m&z=4

You can also set the amount of hill shading you prefer to see on these new maps.  Click Menu ==> Hill shading.  And there is a new URL parameter (&hillshade=) you can use to set the hill shading in any Gmap4 URLs that you make.

A developer in California named Matt (http://CalTopo.com) produced these new topo map tiles from data he obtained from the USGS.  Matt is paying out of his pocket to host these new map tiles on Amazon’s cloud service.  It is my great hope that the Gmap4 user community taken as a whole will be willing to make sufficient donations to pay its share of Matt’s Amazon bill. The Menu button on the map has a ‘donate’ link.

Matt’s high resolution topographic map tiles should cover the states show in green on the following index map.  I think the states that are not done yet are FL, LA, MA, MS, NH, RI, SD, VT and WY.
http://nationalmap.gov/historical/index.html
As the USGS finishes high resolution scans (660 pixels per inch) for the remaining states, Matt will be processing that data into tiles.

The Gmap4 ‘Help’ file has more information on these new maps and also instructions for how you can report any problems you discover.

Second, Gmap4 now includes a trip planning feature called “Make a map”.  You can now click the map to make waypoints, routes and tracks.  You can download your work in a GPX file and then upload that information into many handheld GPS units.  Of course you can also put your GPX file online and then make a Gmap4 URL to display your file.  This feature works worldwide.

Gmap4’s implementation of this feature lets you:
* Click once and create both a waypoint and routepoint
* Edit any data field (including GPS symbol name) that causes information to appear on your GPS screen

“Make a map” quick start:
1.  Zoom in where you want to do trip planning
2.  Set the map view you want
3.  Click Menu  ==> Make a map
4.  Click a few spots on the map.  Distance in miles and kilometers is reported in the lower right corner.
5.  Right click any point
6.  Click “Download GPX file”
7.  Right click the URL to the GPX file and save it on your harddrive
8.  Load the GPX information into your GPS

Each click you just made on the map sets a draggable (click-hold-drag) waypoint and routepoint.  This is the Gmap4 default for trip planning.

For more information on these features, please visit the Gmap4 homepage and download the current Help file.  The sections that describe these new features are marked “(New)” in the table of contents.
Gamp4 Homepage:  http://www.mappingsupport.com/p/gmap4.html

I welcome your suggestions for improvements and any bug reports.

Enjoy!

Joseph, the Gmap4 guy

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Offline Jelf

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Re: Gmap4 - An enhanced Google Map viewer
« Reply #31 on: March 22, 2013, 04:02:41 PM »
Recently Gmap4 was updated to version 4.1 and now includes a unique map-in-a-link feature that is worth mentioning.  Anyone can now make a custom map and save their data right in a Gmap4 link.  You do not need to save your data in a separate file such as a GPX or KML file.  This may be the easiest and faster way for you to make a custom online topographic map.

To try out this feature:
1.  Click Menu ==> Draw and Save
2.  Click the map a few times to set draggable symbols and draw a line
3.  Rightclick any symbol and select “Gmap4 display long link”

You can copy the link that is displayed, paste it into a new browser address bar, hit enter and your custom map will be displayed.

This feature also works on your iPhone, iPad, android and other mobile device.  Remember, Gmap4 is a browser app and your browser has to be online.  After you tap the screen to set some draggable symbols then tap a symbol and select “Action Menu”.  The list of actions include two different ways to save a Gmap4 link that includes your data.

More information on this map-in-a-link feature can be found in the following three places.

1.  What’s new page
Note the tip about deleting the ll and z parameters from your Gmap4 link.
http://www.mappingsupport.com/p/gmap4_whats_new.html

2.  Example page
Scroll down to the section titled “Your map data saved in the Gmap4 link”.  The examples range from basic to advanced and give you a quick way to see some of the kinds of maps you can make with this feature.
http://www.mappingsupport.com/p/gmap4_examples.html

3.  Help file
You can download the PDF file and search it (control-f) for the section titled “Make a custom map with Gmap4 and save it”.
http://www.mappingsupport.com/p/gmap4_help.pdf

Joseph, the Gmap4 guy
Redmond, WA

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Offline RichardM

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Re: Gmap4 - An enhanced Google Map viewer
« Reply #32 on: March 22, 2013, 04:36:36 PM »
Cool upgrade. Here's a rough view of the new Emory Peak trail overlaid onto the My Topo map which shows the old trail:

New Emory Peak Trail
(same map, but without labels)

I did this by selecting my points using the "m - Street Map Google" map, then switching over to "t2 My Topo" before saving the link.

A question: Is there something I'm missing or can you not edit the map once it has been saved? I tried opening it in a separate browser and it doesn't want to let me edit it.
« Last Edit: September 25, 2014, 04:49:47 PM by RichardM »

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Offline Jelf

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Re: Gmap4 - An enhanced Google Map viewer
« Reply #33 on: March 22, 2013, 04:51:45 PM »
A question: Is there something I'm missing or can you not edit the map once it has been saved? I tried opening it in a separate browser and it doesn't want to let me edit it.

Correct.  Presently there is no way to make a Gmap4 link like you did and then open that link in a new browser tab and edit your data.

When you open your link in a new tab, it is read-only.

Hopefully next winter when the monsoons return I can find time to add an edit feature.

Joseph

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Offline RichardM

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Re: Gmap4 - An enhanced Google Map viewer
« Reply #34 on: March 22, 2013, 04:57:46 PM »
A question: Is there something I'm missing or can you not edit the map once it has been saved? I tried opening it in a separate browser and it doesn't want to let me edit it.

Correct.  Presently there is no way to make a Gmap4 link like you did and then open that link in a new browser tab and edit your data.

When you open your link in a new tab, it is read-only.

Hopefully next winter when the monsoons return I can find time to add an edit feature.

Joseph
Fair enough. In the meantime, the url itself is editable, so any minor tweaks can be done manually.

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Offline Jelf

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Re: Gmap4 - An enhanced Google Map viewer
« Reply #35 on: June 14, 2013, 10:04:51 PM »
Some of you already know that Gmap4 is a general purpose file viewing tool for GPX, TPO, KML, KMZ and a couple of other file types.

I have posted beta version 934 (June 13th) that lets Gmap4 also be a general purpose WMS viewer.  Why might you care?  At last count there were approximately 1.2 bazillion WMS servers out there and this beta code can display most of that data.  Specifically, you can:

* Build a Gmap4 link to display multiple layers from multiple WMS servers
* Turn transparent layers on/off one at a time or all together
* Change the stacking order of transparent layers
* Display transparent layers on top of any basemap hardcoded into Gmap4 or on top of any basemap added via WMS

As a software developer, it is always exciting to develop a feature that is first-of-its-kind.  If there is any other software that lets you "click link - see WMS data", I would like to know about it.

For example, here is a link that starts the Gmap4 beta code and displays a basemap which is the Google aerial centered near Denver and a WMS overlay showing the boundaries of federally owned land.  Zoom in for more detail.  This boundary data covers the USA.  A fast way to shift the map to your own area is Menu ==> Search.
http://www.mappingsupport.com/p/beta/gmap4_beta_934.php?ll=39.740986,-104.996338&t=h,Public_land&z=8&markers=||title=<div%20style="font-weight:bold;">Federal%20Land<br%20/>Boundaries<br%20/><a%20href="http://wildfire.cr.usgs.gov/arcgis/services/geomac_dyn/MapServer/WMSServer?request=GetLegendGraphic&version=1.3.0&format=image/png&layer=1"%20target="_blank">Map%20key</a><br%20/><a%20href="http://www.geomac.gov/index.shtml"%20target="_blank">Data%20source</a><br%20/><a%20href="http://www.mappingsupport.com/p/gmap4_about_wms_map.html"%20target="_blank">About%20this%20map</a></div>&wms=http://wildfire.cr.usgs.gov/ArcGIS/services/geomac_dyn/MapServer/WMSServer?layers=1&transparent=true&name=Public_land

The Gmap4 beta page has more examples and documentation showing step-by-step how to make your own Gmap4 links to display any WMS data you wish to see.
http://www.mappingsupport.com/p/gmap4_beta.html

The example maps on the beta page include:
* USA map with current weather radar
* NOAA coastal navigation charts including the most detailed charts
* Current forest fire boundaries
* Index to 1:24,000 scale topos for USA
* Index to 1:50,000 scale topos for Canada
* and more

There might be some kind of limit as to how complex(?) these maps can be.  Gmap4 uses the Google map API but Google’s docs do not mention any such limit.

I would enjoy seeing any cool way you use this feature.

Also, while I am happy to answer questions please help me help you by first reading the information on the beta page.  That information will answer a great many questions.

Joseph, the Gmap4 guy
Redmond, WA

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Offline Jelf

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Gmap4 = View topos/aerials *offline* and your geolocation
« Reply #36 on: September 25, 2014, 02:48:32 PM »
I have posted here before about Gmap4 which is an enhanced Google map viewer that I developed.  Up until this summer I believed that Gmap4 would not work if your mobile browser was offline.

I was wrong.

If you follow a few simple instructions, many (but not all) of the Gmap4 features will work just fine on a smartphone, tablet or other mobile device when you are offline.  Among other things, when you are offline you can:
* Look at high resolution topo maps (t4 Topo High)
* Look at Google aerials
* Look at other basemaps
* Look at GIS overlays
* Turn on the geolocation feature (Menu ==> My location) and see the map become centered where you are standing
* Move and watch the location symbol follow you and the map automatically move as needed
* Touch the location symbol and see your coordinates in the current coordinate format
* Change the coordinate format
* Turn on/off a UTM grid
* Turn on/off a USNG grid

Yes, you can do all of the above while the browser in your smartphone or tablet is offline.  Now let’s pop the hood and see how this works.

Any map you see with Gmap4 consists of a bunch of small image files called “tiles” that are stitched together to cover your screen.  When you look at a map while you are online, a copy of each image file is saved in the browser’s cache.  If you keep the browser tab open that has the Gmap4 map, then you can then go offline and still pan the map over the area for which there are map tiles in the browser’s cache.  If you pan too far, the screen will be white.

To read plain English instructions that I guarantee you will understand (I don’t know how to write computer babble-speak) please visit the Gmap4 Help page and download the pdf file “How To Use Gmap4 Offline”.
Help page: http://www.mappingsupport.com/p/gmap4_help.html

Gmap4 default map: http://www.mappingsupport.com/p/gmap4.php

Joseph, the Gmap4 guy

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Offline RichardM

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Re: Gmap4 - An enhanced Google Map viewer
« Reply #37 on: August 27, 2018, 08:36:55 PM »
Gmap4 (2009 - 2018)

Thank you everyone who had a kind word to say about Gmap4 since I launched it in 2009. Gmap4 had a good run. However due to policy changes at Google, Gmap4 is shutting down for most users as of this evening, July 15, 2018.
Well, foo. There's no telling how many times I've used and posted maps using this tool.

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Offline Jelf

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Re: Gmap4 - An enhanced Google Map viewer
« Reply #38 on: August 27, 2018, 09:46:16 PM »
Not to worry.

I am building GISsurfer which will replicate most of the Gmap4 features.  GISsurfer is based on the free open-source Leaflet map API (Application Program Interface).

The first version of GISsurfer - with limited features - will go 'live' sometime in September.  A good way to hear when that happens is to follow me on twitter.  @mappingsupport

 


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