ArcGIS PRO + PS vectorized land use planning map

demand

A general regulation now needs to be supplemented GIS data , But primitive CAD The file has been lost , Only the final land use plan . How to avoid manual tracing , The vectorized land use plan is GIS data , And write the land type into the property table ？

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Solutions

ArcGIS Pro The middle image can be classified according to RGB Value to split the image , And in the case of supervised classification , Each type RGB The value corresponds to the land type . stay ArcGIS Before image classification in , It is best to PS Delete unnecessary land code and other elements on the land use planning map , And fill in solid color blocks of the same color , This will reduce noise , Make image classification more accurate . After image classification , function eliminate 、 Smooth surface And other tools to improve the vector pattern .

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Operation steps

One 、PS Remove superfluous elements from the plan , And fill with solid colors

Magic wand choose a certain color of land , Reuse choice - modify - Expand 、 choice - modify - shrinkage Tools such as , Add the land code and other superfluous elements to the selection of the magic wand , Finally, fill the solid color block with the same color , Fill in a few more times , Increase color saturation .

ps： If there is a better way , Please comment

Two 、 Register the planning map geographically

ArcGIS Basic operation , Not much to say .

3、 ... and 、 Image classification

1. Create classification schemes and training samples

  stay Training sample Manager in , According to the legend of the plan , Create a new classification scheme , And draw one or two training samples for each land type in the scheme （ The most convenient way is to directly select the color block on the legend ）. Save the classification scheme and training samples , The classification scheme is based on .ecs The suffix file is stored in the computer disk , The training samples are saved as face feature classes .

 2. Run the image classification wizard

Open the image classification wizard , Select supervision 、 Pixel based image classification , Select the classification scheme and training samples created in the previous step , After that, they are basically function and next step , Just follow the process .

ps： Both unsupervised and object-based have not achieved the desired results , I don't know if it is a step error

3、 ... and 、 Grid to face feature

function ArcGIS Self contained Grid to surface Just tools , However, note that the fields need to be selected Class_name, Otherwise, the generated face feature will not have the land name .

Four 、 Trim

1. Eliminate the fine spots

Use eliminate 、 Eliminate face parts And other tools can eliminate redundant fine spots .

2. Smooth patches

Use Smooth surface Tools , You can smooth the serrations of face features , This kind of sawtooth is caused by the grid surface turning and the elimination of fine spots . Be careful , Running Smooth surface Tool time , To handle topology errors, you need to select Select and mark topology errors perhaps Resolve topology errors , Otherwise, gaps will appear between the smoothed parcels .

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results

Get the face feature class with land type

ps： The schematic is very rough , Because the redundant land code was not added as per the first step P fall , Nor did it follow the fourth step