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POINT2D
A POINT2D file type is used to identify entities of the point type, from a
cadastral or thematic model. These entities represented by a single point (for instance,
a landmark or a farm-house) store a coordinate pair X/Y and its respective identifier in
the same ASCII file.
The data syntax inside a POINT2D file type varies as a function of its purpose, that is:
- Create and identify points in a cadastral map - it is required to inform a pair
of coordinates X/Y or Lat/Long, a label, a name (not mandatory) and an object category,
to which the point belongs to (see the figure below).
- Create and identify points in a thematic map - it is required to inform a pair of
coordinates X/Y or Lat/Long the thematic class to which the point belongs to (see the
figure below).
Still in the data section it is possible to use different formats:
- Define a separator (a character: ; or ,) among the data using the keyword
SEPARATOR;
- Use the keywords; CLASS_NAME, NAME, LABEL and CATEGORY_OBJ, described next:
- CLASS_NAME: identify points from a thematic IL to a class;
- LABEL: identify points through a (single) label associated to an objects'
category, in a cadastral map. Each entity can have one or more labels, but has to have
different codes (see more about objects identification in chapter 9);
- NAME: indicates a name of a cadastral entity, it may have repeated names to
different labels. If it is left out the system repeats the label contents during the
importing process;
- CATEGORY_OBJ: it is an identifier of the objects category, when the entity
is represented in a cadastral map.
The first line in the file is a keyword POINT2D. This line forms the identifier
section, which is a mandatory section. For the second line there are the following
options:
- The keyword INFO, identifying the beginning of the information section, which
ends with the keyword INFO_END, but this section is not mandatory, or
- The X Y or LONG LAT point values. This option for the second line only happens if
there is no information section in the file and none of the three keywords required for
the data section are present.
The keyword END shows the end of the data section in the file. There is no constraints
related to the number of entity instances in a file.
The examples presented below show a point file in a thematic map and a point file in a cadastral map.
POINT2D
INFO
// Point 2D and Identifiers if Classified Point
// ASCII file generated by the SPRING System
// project Proj1 information layer Uso1996
// category Usage model THEMATICMODEL
DATUM SAD69, 6378160.000000, 0.003353, 0.000000, 0.000000, 0.000000
PROJECTION UTM/SAD69, 0, 0.000000, -0.785398, 0.000000, 0.000000
BOX o 47 58 10.485, s 15 53 0.000, o 47 46 20.203, s 15 41 0.124
UNITS geographical
SCALE 25000.000000
INFO_END
CLASS_NAME "Cerrado"
o 47 56 59.255 s 15 47 40.251
CLASS_NAME "Campo"
o 47 57 1.457 s 15 48 8.097
CLASS_NAME "Mata"
o 47 56 7.600 s 15 48 15.797
END
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POINT2D
INFO
// Point 2D and Identifiers if Classified Point
// ASCII file generated by the SPRING System
// project Proj1 information layer Mapa_rural
// category Cad_rural model CADASTRALMODEL
DATUM SAD69, 6378160.000000, 0.003353, 0.000000, 0.000000, 0.000000
PROJECTION UTM/SAD69, 0, 0.000000, -0.785398, 0.000000, 0.000000
BOX 653162.837615, 661774.873403, 7400228.734734, 7409547.788588
UNITS meters
SCALE 25000.000000
INFO_END
LABEL "None"
657212.876744 7408419.999536
LABEL "None"
658746.721350 7404350.234287
LABEL "None"
656196.058409 7406557.564592
CATEGORY_OBJ "Farms"
LABEL "FZ012344"
NAME "Sed. Farm "
657212.876744 7408419.999536
CATEGORY_OBJ "Farms"
LABEL "FZ049666"
NAME "Sed. Farm "
658953.531859 7406471.340752
CATEGORY_OBJ "Farms"
LABEL "FZ087564"
NAME "Sed. Farm "
656196.058409 7406557.564592
CATEGORY_OBJ "Farms"
LABEL "FZ065544"
NAME "Sed. Farm "
658746.721350 7404350.234287
CATEGORY_OBJ "Farms"
LABEL "FZ04554"
NAME "Sed. Farm "
658901.829231 7401884.232462
END
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NOTE: When a thematic point or a cadastral point is not
properly identified, that is, not associated to a thematic class or to a cadastral
objects, the line corresponding to the class name or object, must appear as a
LABEL = "None".
The examples presented previously could be represented by separators (semicolon or
comma):
POINT2D
INFO
// Point 2D and Identifiers if Classified Point
// ASCII file generated by the SPRING System
// project Brasilia - information layer: Mapa PTO
// Category: Drainage - Model: THEMATICMODEL
DATUM SAD69, 6378160.000000, 0.003353, 0.000000, 0.000000, 0.000000
PROJECTION UTM/SAD69, 1, 0.000000, -0.785398, 0.000000, 0.000000
BOX 183557.000000, 8246273.000000, 195009.000000, 8258937.000000
UNITS Geographical
SCALE 10000.000000
SEPARATOR ,
// Format coordx , coordy , class_name
INFO_END
o 47 56 59.255 , s 15 47 40.251 , Cerrado
o 47 57 1.457 , s 15 48 8.097 , Campo
o 47 56 7.600 , s 15 48 15.797 , Mata
END
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POINT2D
INFO
// Point 2D and Identifiers if Classified Point
// ASCII file generated by the SPRING System
// project Brasilia - information layer: Points
// Category: Urban_Cadastre - Model: CADASTRALMODEL
DATUM SAD69, 6378160.000000, 0.003353, 0.000000, 0.000000, 0.000000
PROJECTION UTM/SAD69, 1, 0.000000, -0.785398, 0.000000, 0.000000
BOX 183557.000000, 8246273.000000, 195009.000000, 8258937.000000
UNITS Meters
SCALE 25000.000000
SEPARATOR ;
// Format coordx ; coordy ; label ; name ; category_obj
INFO_END
657212.876744 ; 7408419.999536; None
658746.721350 ; 7404350.234287
656196.058409 ; 7406557.564592
657212.876744 7408419.999536 ; FZ012344 ; Sed. Faz ; Farms
658953.531859 7406471.340752 ; FZ049666 ; Sed. Faz ; Farms
656196.058409 7406557.564592 ; FZ087564 ; Sed. Faz ; Farms
658746.721350 7404350.234287 ; FZ065544 ; Sed. Faz ; Farms
658901.829231 7401884.232462 ; FZ04554 ; Sed. Faz ; Farms
END
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NOTE: When a thematic or cadastral point is not properly identified,
that is, not associated to a thematic class or to a cadastral object, the line corresponding
to the class name or object, must have the "None" word. The following points
with nothing written will not be identified. In the example above
the first three points will not have identifiers.
NOTE: When a thematic or cadastral IL is exported with point entities types,
the Points option in the
" Exporting" window, the POINT2D
file is created. By default, when exporting a points file the file name extension is "spr",
with the "_P2D" suffix added to the IL name, that is, *_P2D.spr. However,
when importing the file should have only the extension "spr", in case it was
created by a different system.
About the ASCII format
See about the Importing/Exporting in the SPRING
See also:
How to IMPORT data?
How to IMPORT data from the SGI?
How to IMPORT GRIB images?
How to EXPORT data?
Other ASCII files
[ LINES ] [ POINTS ] [ POINT2D ] [ SAMPLE ] [
GRIDREG
] [ TABLE ] [ TEXT ] [ POLYGONS ] [ NETWORK ] [ NETWORK_OBJECTS ]
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