Calculating Density Map

Divide the specified area into mesh grid and calculates the ratio of total figure area to mesh area in each mesh.

How to Execute

Run from Density Map Dialog

Do one of the following to open Density Map dialog:

  • Select Calculate/Density Map from the context menu that appears when screen is pressed with right-click or right-drag.
  • Right-click on the blank part of Calculation Panel to open the context menu, then select Density Map.

Screen R Click Menu Density Map

Dialog Parameters

Screen Density Map Dialog

Item Action
Mesh Size Specify the mesh size.
Mesh Overlap Size Specify the overlap size of the mesh.
Mesh Origin Specify the mesh origin.
Clip Method Specify how to place the topmost row and rightmost column of the mesh when the specified area is not a multiple of the mesh size.
Area Specify the calculation area.

A preview of the specified area and the resulting mesh grid is shown on screen, and is updated as you change the parameters.

Screen Screen Density Map Dialog

Specify the calculation area in Area and press OK to begin calculation.

The calculation result is saved to Calculation Panel datalist and displayed on screen.

Density Added

Right-click on the calculation result displayed on screen or in the datalist to open the context menu, containing the following items in addition to the default context menu items.

Item Action
Show Show/hide the calculation result on screen.
Display/Highlight Toggle the highlight of the calculation result colormap on screen.
Display/Name Show/hide the name of the calculation result on screen.
Display/Coordinates Show/hide the coordinates of the calculation result on screen.
Display/Cell Info Show/hide the borders of each mesh of the calculation result on screen. You may need to zoom in to see the borders.
Display/Cell Value Show/hide the value of each mesh of the calculation result on screen. You may need to zoom in to see the values.
Color Change the display color of the calculation result on screen.
Style/Outline Show/hide the outline of the colormap of the calculation result on screen.

Load Area File and Calculate

Select Load AreaFile/Density Map from the main menu to open Open AreaFile for Density Map dialog.

File Dialog

Select an Area File and press OK. The calculation is performed on each area described in the file.

Refer to Area File page.

Output the Calculation Results to a File

The calculated results can be saved to a text file in CSV format.

Click the icon on Calculation Panel and select Density Map to open the Save Density Map dialog.

Save Density Map Dialog

Specify the file name and press OK to save the results. The output has the following format:

#Density Created by nebv VERSION (uid=UID) USER@HOSTNAME DATE
#COMMAND addDensityMap
#ARGS AREA="490.8,341.5,530.8,351.5"
#ARGS MESH_SIZE="10,10"
#ARGS OVERLAP_SIZE=0
#ARGS ORIGIN="Selected Area Lower-Left"
#ARGS CLIP_METHOD=Overhang
#xmin,ymin,xmax,ymax,rate,dimension[um^2]
490.8,341.5,500.8,351.5,0.012000,1.200000
500.8,341.5,510.8,351.5,0.150000,15.000000
510.8,341.5,520.8,351.5,0.100500,10.050000
520.8,341.5,530.8,351.5,0.037500,3.750000
530.8,341.5,540.8,351.5,0.037500,3.750000
            :
            :

Run from the Command Line

Specify --density-map-file option with an Area File at startup to execute calculation on each area described in the file after startup. You can also specify the filename to save the calculation results using --density-map-file-out option.

By specifying as follows, the calculation results for the specified range in figure_file will be output to density_map_file.txt:

$ nebv --density-map-file=/path/to/areafile.txt --density-map-file-out=/path/to/density_map_file.txt /path/to/figure_file
$ nebv --density-map-file="0,0,100,100" --density-map-file-out=/path/to/density_map_file.txt /path/to/figure_file

For Area File syntax, Refer to Area File page.

See --density-map-file, --density-map-file-out in Boot Options page.

The calculation method and display method of Density Map can be changed from Preference. See preference Action/Density Mappage for detail.

Restrictions

  • The area of TEXT elements of GDSII, OASIS, etc. and jobdeck titles are not calculated.
  • Overlapping figures are considered separately and not merged. This may result in density over 100% in a mesh.
Density Map File

The file describing the ratio of total figure area to mesh cell area for each mesh-divided area.

Last modified December 23, 2024