This is probably the purpose of making maps, right? This is an aerial photograph. If you want to draw its outline with CAD, I want to achieve the effect of Baidu map, right? If you draw with AutoCAD, you can zoom in or out with the zoom command.

The so-called drawing with 1: 1 should refer to the method of drawing with 1 drawing unit representing 1mm in the drawing interface. This requires knowing the length of any edge in the real world, which is generally used like this. The estimate is accurate to cm. For example, it is measured that the distance from the intersection in the lower left corner of the map to the boundary point between the residential area and the farmland area on the right is 212.78 m. Then, you should insert this map and add a suffix. JPG (if not, you should use ACDSee or other software to convert) to AutoCAD (use the menu "Insert/Raster Image Reference"). Insert magnification at will. Then use dist command to check the graphic unit spacing between these two points, for example, 40.52 graphic units. In order to make it 2 12.78 (that is, to meet the requirements of drawing by 1: 1-in this example, it is represented by 1 drawing unit 1 cm. The magnification can be calculated: 212.78/40.52 = 5.251234. Then, use the Zoom command to enlarge the raster image at a magnification of 5.25 1234. The next step is that you draw directly on this picture (in order to see your newly drawn lines, use different color layers.