100 GIS practical application cases (seventeen) - making 3D map based on DEM

Preface

be based on DEM Make a three-dimensional map , There has to be DEM data （Tin,Terrain And grids DEM All possible ）, Use TIN、Terrain Relatively slow , It is recommended to use grids DEM, Low resolution , Process faster , About DEM The operation of data can be seen 13 Chapter on grids DEM Create chapter content . Make a three-dimensional map , It is recommended to use the projection coordinate system , Multiple data used to make 3D map , The coordinate system should be consistent .

Use DOM Make

DOM It's digital orthophoto , It can be satellite images （ Satellite film ） Or aerial images （ Aerial photograph ）, It can also be photographed by UAV . But ask for DOM Data and DEM Data space XY The positions must be superimposed .

Using data ：“chp14\dem.gdb\DOM and DEM”, Use DOM Data and DEM The operation of data making 3D map is as follows ：

1. open ArcScene（ Be careful ： No ArcMap）;

2. Add data “chp14\dem.gdb\” Medium DOM and DEM The data of ;

3. stay DOM Right click on the data → Property setting interface , Pictured 14-2 Shown . stay “ Basic height ” In the options , take “ Float on a custom surface ” Option selected .

chart 14-2 DOM 3D production

4. close DEM Layers , See the effect as shown in the figure 14-3 Shown .