The following statement about DEM data acquisition is wrong: ()

The following statement about DEM data acquisition is wrong: ()

Using total station or electronic theodolite and rangefinder to measure the three-dimensional coordinates of each target point is suitable for the ground model with high accuracy in a small area.

Using aerial or space remote sensing data as data source, we can establish a three-dimensional model of space terrain and measure elevation data according to various photogrammetry methods.

We can choose the recent small-scale topographic map as the data source, obtain the elevation data of ground points by manual method or scanning digitizer, and establish DEM.

Data acquisition is the key of DEM, and the collected data points should not be too sparse or too dense.

Correct answer: you can choose the recent small-scale topographic map as the data source, and obtain the elevation data of ground points by manual method or scanning digitizer to establish DEM.