How to download

How to view downloaded maps

How to combine small images into one big map

Some problems when downloading

How to export tiles to sqlite database

How to know the longitude and latitude of each image

How to download other type maps

How to use offline maps in RMaps or OruxMaps

What projection does Google Maps use?

 

How to download?

See the screenshot. It is very easy to use.

1, Enter a task name, such like "Mytask.egmd". All task files are saved as *.egmd.
If you want to continue a old task, click button "Open task... ".

2, Select Maps type. There are 5 types of maps.


3, There are 4 parameters (Left Longitude, Right Longitude, Top Latitude, Bottom Latitude) to define the area scope of images that you want to download.

Left Longitude: -180<=value<=180, for East, the value is positive, for West, the value is negative.
Right Longitude:-180<=value<=180, for East, the value is positive, for West, the value is negative.
Top Latitude:-85<=value<=85,for North, the value is positive, for South, the value is negative.
Bottom Latitude:-85<=value<=85,for North, the value is positive, for South, the value is negative.

For longitude and latitude, the input measurement is degree. You can convert the measurement of "Degrees, Minutes,Seconds" to "Degrees" by click menu "Tools->Convert 'Degrees,Minutes,Seconds' to 'Degrees'...".

The followed sketch map explains the area scope:

How to get the latitude/longitude information from Google Maps?

You can right-click a location on the map(http://maps.google.com) and select "What's here?" , The coordinates of that location will automatically appear in the Search box at the top of the page.

4, Define the zoom level. The zoom level defines the image precision. For trial version, the max zoom level is 13, so you can not download high precision images.

5, Select a path to save the project and downloaded images

6, Then click button "Start", OK, start downloading now ... !

When downloading, the log window will display the downloading process. When finished, the log will be saved to a file.

After downloading, there will be a file named as *.ftl, if there are some files failed or missed, you can re-download them: menu "tools"->"re-download failed files".


 How to view downloaded maps?

You can view downloaded maps without combining them into one big BMP.
We provide a tool to view the images, you can run it from menu "Tools"->"Map Viewer".

Then open a task from menu "File"->"Open task..." to view the map.


 

How to combine small images into one big map?


After downloading, all small images are saved on your disk. Then you can combine them into one big image map.

We provide a tool : Combiner.exe. You can run it from menu "Tools"->"Map Combiner".


It can output bmp file with a bpw file. And it can also create a georeferenced tif file, and a map file for OziExplorer. You can convert it to other format by yourself using some image tools such like PhotoShop.

If the bmp file size is too big, you can use tool "BMP Splitter" to split it into some small bmp files.

Some problems

1. Google map uses a protection mechanism to keep a good quality of service. If one makes too much requests, google map will add its IP address to a blacklist, and you may see a message:

Google Error : 403 forbidden

If this happend, Satellite Maps Downloader will show a messge in log window: May be your IP is banned by Google. Then you must wait for some time or change to another IP.

2. For some area, there are not high precision images on google's server, so may be caused a error when you try to download such images. If this happend, you need to set smaller zoom size to download. (For most areas, the max zoom level is 18)

How to export tiles to sqlite database

Click menu->'Export toMBTiles db', then will show this window:

There are 3 types of db that you can choose.

And if you select MBtiles format, after exporting, you can view this .mbtiles file with MBTiles Viewer:

You can also use the mbtiles file in some Android or IOS Apps.

 

How to know the longitude and latitude of each image

There are two methods to know the longitude and latitude of every downloaded image.

1. After downloading, the software will create a text file named as "projectname_list.txt" in your project path. In this file all the images' longigude and latitude information are saved.

The file looks like:

ImageFileName     Left_Edge_Longitude     Right_Edge_Longitude     Top_Edge_Latitude     Bottom_Edge_Latitude
gs_132778_90181_18.jpg: 2.34283447265625 2.34420776367188 48.86019753088974 48.85929403653233
gs_132778_90182_18.jpg: 2.34283447265625 2.34420776367188 48.85929403653233 48.85839052586621
gs_132778_90183_18.jpg: 2.34283447265625 2.34420776367188 48.85839052586621 48.85748699889132
gs_132778_90184_18.jpg: 2.34283447265625 2.34420776367188 48.85748699889132 48.85658345560756


2. When you view map in Satellite Viewer, the longitude and latitude will be displayed in the statusbar.

And in the log file, the exactly longitude and latitude of the downloaded area are saved as Left Longitude download.., etc.

 


 

How to download other type maps?

Google Maps Downloader can only download images from Google Maps, if you want to download other types of maps, we provide other tools:

Universal Maps Downloader: It can download maps from many maps servers. Maps type including: google street maps, google satellite maps, google terrain maps, google hybrid maps, yahoo street maps, yahoo satellite maps, yahoo hybrid maps, bing street maps, bing satellite maps, bing hybrid maps, openstreetmap normal map, openstreetmap transport, openstreetmap cycle map, openstreet map mapquest map, openstreetmap humanitarian, yandex map, yandex satellite, ovi street map, ovi satellite map, ovi terrain map, ovi hybrid map, mapquest normal map, mapquest satellite, ordnance survey maps, amap satellite, qq satellite, qq terrain, qq map, baidu satellite, baidu map, the national map, Mappy, ArcGis Online, ViaMichelin, Whereis, etc.

Offline Map Maker: Difference from Universal Maps Downloader: Offline Map Maker can downloads multi zoom level in one task, but Universal Maps Downloader can only download single zoom level in one task.

google earth images downloder: It can download images (including historical imagery) from google earth servers, not google maps.


How to use offline maps in RMaps or OruxMaps?

After exporting all downloaded tiles into a sqlite database, then you can use the sqlite file in some Android apps, such like RMaps and OruxMaps.

For RMaps: When you finished export tiles to sqlite database with export type 'For RMaps', you will get a file: your_task_name.gmd.sqlitedb, then copy it to your Android device, to your RMaps installed path, might be like '/sdcard/rmaps/maps/', then refresh your RMaps offline maps, you will see a new offline maps "your_task_name_gmd.sqlitedb".
Note: when you view the offline maps in RMaps, you need to zoom it to your downloaded zoom level, otherwise, it will show blank maps.

For OruxMaps: When you finished export tiles to sqlite database with export type 'For Oruxmaps', you will get two files: your_task_name.gmd.otrk2, your_task_name.gmd.OruxMapsImages.db, you need to rename the your_task_name.gmd.OruxMapsImages.db to OruxMapsImages.db, then on your Android device, in your OruxMaps installed path, might be like '/storage/emulated/0/oruxmaps/mapfiles/', create a new folder suchlike 'exmaple', then copy "OruxMapsImages.db" and "your_task_name.gmd.otrk2.xml" to this folder, refresh your oruxmaps offline maps, you will see a new offline maps "your_task_name_gmdmap".


What projection does Google Maps use?

Google Maps uses Web Mercator ( EPSG:3857), more detail information about it, you can goto these links to see:

http://wiki.openstreetmap.org/wiki/EPSG:3857

http://spatialreference.org/ref/sr-org/6864/

http://gis.stackexchange.com/questions/48949/epsg-3857-or-4326-for-googlemaps-openstreetmap-and-leaflet