Surfer grid file clipping

Bloggers have been using Surfer9, Because its data processing capacity can not meet the requirements of large amount of data processing , Download a new version Surfer Software Surfer20.Surfer20 The interface and menu of Surfer9 Significantly different , such as Surfer Grid file clipping function , stay Surfer9 This function is Grid Under the menu blank Sub menu , stay Sufer20 in Assign NoData Undertake this function .

Grid file clipping is mainly bln Making of format file , The format is as follows ：

　　length,flag "Pname 1"

　　x1,y1

　　x2,y2

　　...

　　xn,yn

length： That is, the number of coordinates in the whitening range , Pay attention to closing （ The coordinates of the polygon start point should be repeated at the end ）

flag ：0 Represents albino interior

　　　1 Represents albino exterior

Example files are as follows ：

12,1             --12 That's ok , Albino exterior       
447896.8534,4240768.6419
448242.1847,4240277.9829
448439.8643,4240417.1124
457113.6534,4246521.8428
458450.2697,4245803.5905
458734.2806,4246332.1147
457234.4832,4247138.0550
455734.6857,4247943.9953
455450.6747,4247415.4711
456522.5159,4246839.5000
448026.2788,4240859.7332
447896.8534,4240768.6419

Start and end points must be the same
The original grid file is as follows ：

After clipping, the grid file is as follows ：