surroundings

Vector illustration

Find function ** Google Maps (with offset) **
In the upper right corner ** select the administrative area **, find the area to download
Here we need to make a special note: BigeMap has limits on the downloading of vector data, so the administrative area cannot be too large (customer service is recommended to districts and counties)

** administrative boundary function only choose to counties to check Township **
Vector download limit 2

Double-click the download area, and a download dialog box pops up **
First select ** administrative boundary tag download, input task name / save path / storage format / coordinate projection (where the first selection in WGS84 geographic coordinate system, the subsequent need to convert) / boundary type **
After downloading, I found that although we checked ** provinces / cities / districts / townships **, they were all put in a shp

The effect is this:
shp data effect

Therefore, after the data download is completed, you can process it again and divide it into layers or download it separately.

Download the complete data or WGS84 coordinate system, we also need to look coordinate system conversion, first to the WGS84 coordinate system plus offset (GCJ02), menu bar ** toolbox where to find the data correction **
** Source File pop-up dialog box, select the just downloaded the shp, save it as your new directory, select the latitude and longitude plus partial **, you can determine the point
In this way, WGS84 to GCJ02 is completed, and then in the toolbox, continue to find the ** vector conversion ** function
** vector coordinate transformation in the dialog box, the source file data plus bias selected, the output file selected output path, object coordinate system selected world following WGS84 / World Mercator **, can point conversion.
At this point, the BigeMap data has been downloaded, and personally feel that the operation is not user-friendly. Especially in the process of downloading vector data, it is impossible to download in batches. If you download data such as water systems, roads, and greening, they are all in one layer. Intervene.
The next step is to process the downloaded data: merge scattered administrative districts and towns into a whole; cut vector elements (water systems, roads, etc.) into regions. The main tool is ArcMap.

As mentioned earlier in BigMap, the smaller the data unit for download, the better, so we downloaded the administrative divisions of townships in districts and counties. See that each district is a separate shp data.
The second step we need to merge these scattered data into a shp file
In the Merge tool, load all township shp, click OK
After the merge is completed, a Merge file will be automatically generated, this is the merged data
BigeMap's township data and administrative area layer are offset. The customer service reply is caused by different data sources. There is no way to adjust it by ourselves. Fortunately, not much biased, ** Editor tool move on to what can be. Note here: the township layer is moved to the administrative area of districts and counties, because the administrative area of districts and counties is correct, this should be used as a standard **

For vector data, taking roads as an example, BigeMap will put all the downloads in one layer, which will only be divided by points, lines, and areas, not by type, and there is no distinction between attribute information (comparison pit) . Later, I studied it myself and found that if all the parent nodes are checked, all the data under the parent nodes will be placed in a layer. After consulting with the customer service, the customer service suggested that if you want to download all the data, divide it in two times. For the first time, leave one in each structure and do not download it, so that the parent node is not selected. Not downloaded

All data download method

We want to distribute pictures, and each type can only be downloaded separately.
After the download is completed and opened, I see that BigeMap's vector data is actually downloaded according to the picture frame (rectangular frame), and is not cropped according to the selected district.
After selecting the crop boundary, find the clip tool
** Input Features select the layer to be cropped, Clip Features * Select the crop boundary layer (Districts, counties and townships must first select the township * / township layer)
Repeat step 5 until all layers are cropped
Finally, merge all the cropped data (Merge)

The prerequisite for downloading the electronic map is that a vector district / county boundary layer that has been processed needs to be completed
Find ** Google Map (with offset) **
Switch to the ** map in the upper left corner (the steps to download satellite maps are the same as the electronic maps, just switch to satellite ** here )
Find the import boundary on the menu bar **
Add the processed data boundary and select the slice range
Here the range double click range download
Fill in the options and click download