Hi All,
Happy #MapInfoMonday / #MapBasicMonday!
Today I want to introduce you to a MapBasic application developed based on a question asked in MapInfo Community.
The question is asked by Michele Burgalossi , to select objects that intersect with another object but not overlap i.e., only share (touch) by a common point or border.
I have developed a MapBasic application and named it as "Advance Geo Select.mbx", You can download it from below. After running you can see the Advance Geo Select button under Legacy tab. This program does not do any change in the table /records.
We will test it with 2 tables named BluePoly and GreenPolygon. You can see that Green 1 & Green 4 Polygons touches Blue 1 & Blue 2 Polygons, Green 5 does not intersects with any of them. There are all kinds of object types exist in BluePoly layer.
When the Advance Geo Select button clicked the dialog will be displayed.
There are 3 types of operation in the middle list.
1. Relations
First option selects region object from Table 1 where objects Touches but not Overlaps with Table 2, i.e. Green 1 and Green 4 records
Second option selects region object from Table 1 where objects Overlaps but not Touches with Table 2, i.e. Green 2 and Green 3 records
The regular operators exists in SQL dialog listed in the form, from Contains to Intersects.
To select the reverse of the expression choose Select Reverse option under the relations list.
2. Combined Objects / No Objects
There may be some combined polygons and polylines in the table, to select them simply choose it from the list. This option will record "Combined Polygon" and "Combined Polyline" records.
The result of combined objects are as shown below.
If you want to select records without any object linked, choose Rec w/o Objects from the list. This option will list the "No Object" record.
3. Show Area/ Length/ Perimeter / Centroid
If you want simply to display area, length, perimeters or Centroids of objects, you can use the last part of the list.
The area or perimeter of regions, the length of lines are displayed like below
The coordinates can be shown in Degrees, table projection or map projection (if the front window is a mapper)
The coordinates in degrees shown below .
Hope this post can be helpful who needs such functions.
Please let me know if there is any problem with the MBX.
Best regards
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Ahmet Dabanli
Başarsoft
Türkiye
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