Stitchmaps was one of the best applications that were made to create orthophotos from mosaics captured from Google Earth, from how does it work I spoke a long time ago.
Who did the process before, walking, downloading screenshots of Google and then joining them with PhotoShop or Bentley Descartes, we know that Stitchmaps does much more than that. Each capture requires a special calibration with respect to the previous one; by doing it manually you can see that each box has a small incremental rotation along a curved line, which Google does on purpose and also because it is a flat representation of the curvature of the earth. So what Stitchmaps does is capture the stream Directly from the ActiveX and calibrating it against the mosaic that does at the beginning, cutting the edges right in the control nodes that are seen when we downloaded the calibration file for Ozy Explorer.
For that reason the servers of Google Earth can not detect the download, as happened with Manifold GIS, which blocked the IP. But in this case, the capture is done from the ActiveX.
After a couple of years of using it, here I answer doubts that I often find there:
1 Where to download Stitchmaps?
That question remains unanswered, unfortunately the site that distributed it is not active. After a while entertained with a possible demand from Google to distribute a commercial program that violated its terms. Blessed are we who spend the equivalent of taking the pretty-eyed girl to an a la carte restaurant, since it can no longer be bought. Maybe we will not see another version higher than Stitchmaps 2.6 for sale, not for US $ 49. It would be worth acquiring it while it seems there is availability pTo buy in Shareit!, Although it is not available for trial download.
Beware, that it does not exist either does not mean that it is legal to pirate it. By the way, several of the configurations that I show in this post, only have the Stitchmaps Plus 2.6 version, so some do not apply to 2.5 or earlier versions.
2 Is it a crime to download images with Stitchmaps?
It is not a crime to use an application that we have legally purchased. It is also not a crime to download Google images and merge them, whether we use this program or a combination of printscreen plus a couple of scripts to cut edges and modify the header of each image. What is crime is to use the images of Google for commercial purposes without your permission, so if they are going to be used for municipalities where the change of government of each 4 years takes away the profitability of the cadastre, we could say that it is not a crime. ????
3 Why can not I save the image?
Only the paid versions save the image, the trial versions only make the capture and show how the mosaic would look.
4 What version of Google Earth does Stitchmaps work with?
Works with any version, the most recent is recommended.
5. Why do you hang when saving the image?
This has to do in most cases because we have RAM problems. In general, the process runs, and just when it is going to be saved, a message appears saying "Not valid control", Then a blasphemous message is displayed in German and it is hung to never save the image. There are different variables that influence this, taking them into account can help us not to collapse the memory:
- The format of saving, it is advisable to use jpg, because no matter how we select the tiff, the quality of the image will not improve, but in return it will weigh a barbarity of MB.
- The capture size of the area is recommended 512 × 512. Similarly, choosing large areas does not benefit at all, since the capture made by Stitchmaps is the printscreen.
- The compression quality of the jpg is recommended 70.
- The pixel format is recommended 24 bits, to keep the tones. Although using 16 bits does not change the big thing.
- It is also not appropriate to make mosaics that are too large. A mosaic of 10 × 10 will come out very fast, but one of 24 × 24 requires the computer to have a RAM above the 2 GB. It is preferable to lower in parts, and with heights around the 400 meters.
It is advisable to activate the "Automatically save map image", So that before deploying the armed mosaic has already saved it, so if it freezes no longer matters.
Additionally, it is advisable not to have many programs open while running Stitchmaps, since they load RAM unnecessarily. I recommend closing some extra routines, using the task manager via Ctrl + alt + del And close unnecessary processes like iTunes Helper, Google updater, HPutilities, Adcrobat reader, etc.
The Google watermark or compass appears
In order to avoid that each capture takes data that later ruins the mosaic, it is necessary to deactivate the compass and the status bar of Google Earth. Usually happens when you have very low resolution in the configuration of the monitor, a piece of the Google logo in each image; this is resolved by expanding the splice area indicated as "Map images overlapping" In general with 10% it goes well, but it can be carried to 15 or 20 if necessary.
How to georeference the image.
There are other ways to do it, directly with a GIS program that supports kml and rectification of images. In my case I have used is the following procedure:
- In Google Earth I draw a quadrant of the area that I want to download, using the polygon drawing and with the option just outline. If it's too big, I add additional lines to make a grid.
- Subsequently, under the entire mosaic, leaving that layer containing the polygon lit, so that it is stored embedded in the final image.
- I save the polygon as kml
- I open it with a GIS program, like Manifold GIS or gvSIG.
- I assign the projection using Google Earth, geographical coordinates of latitude, longitude and Datum WGS84
- Then, I modify the projection by assigning it UTM and Datum of interest (Example Zone 18 North, and Datum WGS84)
- I export it to dxf to open it as a vector file in a CAD program.
- Then, in the CAD program, which can be Microstation or AutoCAD, I call the image with the option to manually position it and then the Warpeo Using as origin the corners drawn in the map and as destination the corners of the vector polygon.
A good time to do the downloads is at night. Especially because you can load a large mosaic and go to sleep for a while or watch TV. So as not to waste time and go out with surprises, you have to remember that you should not be using any other program because the use you are taking will be loaded in the printscreen Of the images ruining all your work.
Also remove the screen protectors that could be activated by not having mouse movement, or energy savers that turn off the monitor or hard drives after a certain time.
Other alternatives to Stitchmaps are Allallsoft, also Civil 3D does something although with size and resolution limitations, PlexEarth is pretty good y Google Images Downloader Which is no longer seen there.