RONCC/Geografic-Information-System @ baa791e3e9b77e62b231b5b8b51a58db49d108d6

Markus Metz baa791e3e9 avoid struct stat		14 年之前
..
Makefile	002bbe23df Keep all library dependencies in Grass.make	15 年之前
README	da6b6e3a9f orthography	15 年之前
area.c	b06b8a0105 vectorlib:	15 年之前
array.c	b06b8a0105 vectorlib:	15 年之前
ascii.c	92ba88a4e4 accept D:M:S coords in standard mode (merge from devbr6)	14 年之前
box.c	b06b8a0105 vectorlib:	15 年之前
break_lines.c	b06b8a0105 vectorlib:	15 年之前
break_polygons.c	62a5737c3b add balanced search tree to lib, update Vlib and segment	15 年之前
bridges.c	c6a35b1124 Vect.h renamed to vector.h	16 年之前
buffer.c	c6a35b1124 Vect.h renamed to vector.h	16 年之前
buffer2.c	73623901d6 added missing headers	15 年之前
build.c	e62a3956c9 libvect: implement V1/2_delete_line_ogr()	15 年之前
build_nat.c	aee6f2ede5 only attach isles that are not attached	14 年之前
build_ogr.c	e62a3956c9 libvect: implement V1/2_delete_line_ogr()	15 年之前
cats.c	5e156c2c1a v.clean: OGR support (read access)	15 年之前
cindex.c	b06b8a0105 vectorlib:	15 年之前
clean_nodes.c	b06b8a0105 vectorlib:	15 年之前
close.c	6d806ab04c support GV_FORMAT_OGR_DIRECT	15 年之前
close_nat.c	c6a35b1124 Vect.h renamed to vector.h	16 年之前
close_ogr.c	994deb050b initial steps towards direct OGR support (map/layer <-> OGR dsn/layer)	15 年之前
constraint.c	b06b8a0105 vectorlib:	15 年之前
dangles.c	c6a35b1124 Vect.h renamed to vector.h	16 年之前
dbcolumns.c	c6a35b1124 Vect.h renamed to vector.h	16 年之前
dgraph.c	73623901d6 added missing headers	15 年之前
dgraph.h	b06b8a0105 vectorlib:	15 年之前
e_intersect.c	1118067a86 vlib: modify prototypes to use 'const'	16 年之前
e_intersect.h	11cd111cbd Vlib: Vect_line_buffe2(), Vect_area_buffer2(), Vect_point_buffer2() and	16 年之前
error.c	b06b8a0105 vectorlib:	15 年之前
field.c	14a816989c don't set layer to 0 for layers without table	15 年之前
find.c	b06b8a0105 vectorlib:	15 年之前
geos.c	bffe7d50e6 Revert https://trac.osgeo.org/grass/changeset/38872 (re-instate https://trac.osgeo.org/grass/changeset/38867)	15 年之前
graph.c	b06b8a0105 vectorlib:	15 年之前
header.c	619b3f6325 Eliminate G_index(), G_rindex(); replace with strchr(), strrchr()	15 年之前
hist.c	f2f1c00894 Vect_hist_copy: skip empty old hist	15 年之前
init_head.c	bfe1fa1a17 initialize and set proj and zone in vector head	15 年之前
intersect.c	69268e2741 Vlib new spatial index	16 年之前
legal_vname.c	69ac420b2f gislib G__name_is_fully_qualified() renamed to	15 年之前
level.c	c6a35b1124 Vect.h renamed to vector.h	16 年之前
level_two.c	654df1b78e long -> plus_t	15 年之前
line.c	2b364a9280 vlib: new fns - Vect_line_get_point() & Vect_get_num_line_points()	15 年之前
list.c	2b364a9280 vlib: new fns - Vect_line_get_point() & Vect_get_num_line_points()	15 年之前
map.c	baa791e3e9 avoid struct stat	14 年之前
merge_lines.c	b06b8a0105 vectorlib:	15 年之前
net.c	c6a35b1124 Vect.h renamed to vector.h	16 年之前
open.c	31176b9605 fix https://trac.osgeo.org/grass/changeset/42320	15 年之前
open_nat.c	31176b9605 fix https://trac.osgeo.org/grass/changeset/42320	15 年之前
open_ogr.c	9bc3508fdb cosmetics	15 年之前
overlap.c	c6a35b1124 Vect.h renamed to vector.h	16 年之前
overlay.c	c6a35b1124 Vect.h renamed to vector.h	16 年之前
poly.c	b06b8a0105 vectorlib:	15 年之前
read.c	d308642604 vlib: Vect_get_field_number() added	15 年之前
read_nat.c	b06b8a0105 vectorlib:	15 年之前
read_ogr.c	4b918ac7d8 vlib: fix reading areas from OGR sources	15 年之前
remove_areas.c	f7d1fde6fa partially revert https://trac.osgeo.org/grass/changeset/42962	14 年之前
remove_duplicates.c	b06b8a0105 vectorlib:	15 年之前
rewind.c	6d806ab04c support GV_FORMAT_OGR_DIRECT	15 年之前
rewind_nat.c	c6a35b1124 Vect.h renamed to vector.h	16 年之前
rewind_ogr.c	c6a35b1124 Vect.h renamed to vector.h	16 年之前
select.c	b06b8a0105 vectorlib:	15 年之前
simple_features.c	16ef6508ae fix prototype names (SFA)	15 年之前
sindex.c	309fab1b5f select 3D lines with 2D polygon	15 年之前
snap.c	62a5737c3b add balanced search tree to lib, update Vlib and segment	15 年之前
tin.c	b06b8a0105 vectorlib:	15 年之前
type.c	c6a35b1124 Vect.h renamed to vector.h	16 年之前
window.c	c6a35b1124 Vect.h renamed to vector.h	16 年之前
write.c	021f34879d format	15 年之前
write_nat.c	61b671bb99 cosmetics	14 年之前
write_ogr.c	6221b2619e vlib: add missing doxygen strings	15 年之前

		
				README
			
				   Dangles
  ---------
GRASS doesn't allow areas/islands with dangles. If an island has dangle, it is not built
and attached to outer area and as a consequence, some functions do not work as expected.
For example Vect_area_area() and Vect_find_area().
Se comments in build_nat.c: Vect_attach_centroids()

   Category index
  ----------------
Category index is created when Vect_build(), i.e. Vect_build_partial(, GV_BUILD_ALL,) 
is called. Plus_head.cidx_up_to_date is set to 1 if Category index is created.
Any later call to Vect_write_line() / Vect_rewrite_line() / Vect_delete_line() resets
Plus_head.cidx_up_to_date to 0 and doesn't update category index. 
All modules using update on level 2 must call full build, i.e. Vect_build(), at the end.

All features without category are written to category index of field 0. 
The category index also stores type of feature, that makes it possible to find areas
without centroid through category index.