e00数据格式分析.txt

NALYSIS OF ARC EXPORT FILE FORMAT FOR ARC/INFO

                            ANALYSIS

                               OF

                     ARC EXPORT FILE FORMAT
                                
                               FOR

                      ARC/INFO (REV 6.1.1)










                       TABLE OF CONTENTS

1    INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . .  1

2    OVERALL ORGANIZATION. . . . . . . . . . . . . . . . . . .  2

3    ARC FILE FORMATS. . . . . . . . . . . . . . . . . . . . .  3
     3.1  ARC. . . . . . . . . . . . . . . . . . . . . . . . .  4
     3.2  CNT. . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.3  LAB. . . . . . . . . . . . . . . . . . . . . . . . .  7
     3.4  LOG. . . . . . . . . . . . . . . . . . . . . . . . .  8
     3.5  PAL. . . . . . . . . . . . . . . . . . . . . . . . .  9
     3.6  PRJ. . . . . . . . . . . . . . . . . . . . . . . . . 11
     3.7  SIN. . . . . . . . . . . . . . . . . . . . . . . . . 12
     3.8  TOL. . . . . . . . . . . . . . . . . . . . . . . . . 13

4    INFO FILE FORMATS . . . . . . . . . . . . . . . . . . . . 14
     4.1  .AAT . . . . . . . . . . . . . . . . . . . . . . . . 15
     4.2  .ACODE . . . . . . . . . . . . . . . . . . . . . . . 16
     4.3  .BND . . . . . . . . . . . . . . . . . . . . . . . . 17
     4.4  .PAT . . . . . . . . . . . . . . . . . . . . . . . . 18
     4.5  .PCODE . . . . . . . . . . . . . . . . . . . . . . . 19
     4.6  .TIC . . . . . . . . . . . . . . . . . . . . . . . . 20

5    CONCLUSION. . . . . . . . . . . . . . . . . . . . . . . . 21

APPENDIX A:  SAMPLE EXPORT FILE BEFORE TOPOLOGY. . . . . . . . 22

APPENDIX B:  SAMPLE EXPORT FILE AFTER POLYGON TOPOLOGY . . . . 24

APPENDIX C:  SAMPLE EXPORT FILE AFTER LINE TOPOLOGY. . . . . . 27

APPENDIX D:  SAMPLE EXPORT FILE FOR POINT COVERAGE . . . . . . 30

APPENDIX E:  SAMPLE EXPORT FILE FOR SINGLE-PRECISION
     COVERAGE. . . . . . . . . . . . . . . . . . . . . . . . . 35

APPENDIX F:  SAMPLE EXPORT FILE FOR DOUBLE-PRECISION
     COVERAGE. . . . . . . . . . . . . . . . . . . . . . . . . 37
1   INTRODUCTION


Note:  ESRI considers the export/import file format to be
proprietary.  As a consequence, the identified format can only
constitute a "best guess" and must always be considered as
tentative and subject to revision, as more is learned.

It appears that all ARC/INFO files except user-created lookup
tables are exported, including .ACODE and .PCODE.
2   OVERALL ORGANIZATION

The export file begins with a line with three fields.

     1-   an initial 'EXP'
     2-   what appears to be a constant of '0'
     3-   the pathname for the creation of the export file

The export file ends with a line beginning 'EOS'.

The ARC files are included first, in alphabetical order except
for the SIN, LOG, and PRJ files which occur last.  Then the INFO
files are included in alphabetical order.

The beginning of each ARC file is indicated by the file name (a
three-character identifier) followed by '  2' for single-
precision or '  3' for double-precision.  Single-precision
carries 8 digits, and double-precision carries 15 digits.

Each ARC file ends with a line of seven numbers beginning with a
-1 and followed by six zeros, except the SIN, LOG, and PRJ files
which end in 'EOX', 'EOL', and 'EOP', respectively.  The LAB file
uses a slight variation of this -1 ending line (see below).  The
format for each ARC file is specific to that type of file.  These
formats are covered below.

The beginning of the INFO file section is indicated by 'IFO  2',
and its end is indicated by 'EOI'. The INFO files each begin with
the file name.  For example, the polygon attribute table would be
'STDFIG24C.PAT' on a line by itself.  The format is the same for
every INFO file.  This format is given below.
3   ARC FILE FORMATS

Formats will be given for the most common ARC files:

         ARC
         CNT
         LAB
         LOG
         PAL
         PAR
         PRJ
         SIN
         TOL
3.1 ARC

The ARC (arc coordinates and topology) file consists of repeating
sets of arc information.  The first line of each set has seven
numbers:

     1.   coverage#
     2.   coverage-ID
     3.   from node
     4.   to node
     5.   left polygon
     6.   right polygon
     7.   number of coordinates

The subsequent lines of a set are the coordinates with two x-y
pairs per line, if the coverage is single-precision.  If there
are an odd number of coordinates, the last line will have only
one x-y pair.  Double-precision puts one coordinate pair on each
line.

An example of an actual ARC section follows:

ARC  2
         1         2         2         1         1         2         2
 3.4029994E+05 4.1001998E+06 3.4009988E+05 4.1002000E+06
         2         3         3         2         3         2         2
 3.4050000E+05 4.1001998E+06 3.4029994E+05 4.1001998E+06
         3         1         1         4         1         2         4
 3.4009988E+05 4.1002000E+06 3.4040006E+05 4.1003995E+06
 3.4090012E+05 4.1002000E+06 3.4070003E+05 4.1001995E+06
         4         4         4         3         4         2         2
 3.4070003E+05 4.1001995E+06 3.4050000E+05 4.1001998E+06
         5         6         3         4         4         3         3
 3.4050000E+05 4.1001998E+06 3.4059997E+05 4.1001002E+06
 3.4070003E+05 4.1001995E+06
         6         7         4         5         1         3         3
 3.4070003E+05 4.1001995E+06 3.4079997E+05 4.1000002E+06
 3.4019978E+05 4.1000000E+06
         7         5         5         2         1         3         2
 3.4019978E+05 4.1000000E+06 3.4029994E+05 4.1001998E+06
        -1         0         0         0         0         0         0

An example of a double-precision ARC section follows:

ARC  3
         1         0         0         0         0         0         7
 3.40200000000000E+05 4.10000000000000E+06
 3.40300000000000E+05 4.10020000000000E+06
 3.40500000000000E+05 4.10020000000000E+06
 3.40600000000000E+05 4.10010000000000E+06
 3.40700000000000E+05 4.10020000000000E+06
 3.40800000000000E+05 4.10000000000000E+06
 3.40200000000000E+05 4.10000000000000E+06
         2         0         0         0         0         0         4
 3.40100000000000E+05 4.10020000000000E+06
 3.40400000000000E+05 4.10040000000000E+06
 3.40900000000000E+05 4.10020000000000E+06
 3.40100000000000E+05 4.10020000000000E+06
        -1         0         0         0         0         0         0

3.2 CNT

The CNT (Polygon Centroid Coordinates) file contains the centroid
of each polygon in the coverage.  It has sets of centroid
information with an initial coordinate line and, if there are
labels, one line per label giving the number for the label.  The
coordinate line has three fields:

     1-   number of labels in polygon
     2-   centroid x
     3-   centroid y

An example of an actual CNT section follows:

CNT  2
         0 3.4048516E+05 4.1001702E+06
         1 3.4046691E+05 4.1002662E+06
         1
         1 3.4048875E+05 4.1000852E+06
         2
         0 3.4060000E+05 4.1001665E+06
        -1         0         0         0         0         0         0

3.3 LAB

The LAB (label point coordinates and topology) file consists of
repeating sets of label point information.  The first line of
each set has four numbers:

     1.   coverage-ID
     2.   polygon which encloses it
     3.   x coordinate
     4.   y coordinate

The second and final line of the set gives the label box window. 
This information is marked as marked as obsolete in the SDL
documentation.  It currently contains repetitions of the x and y
coordinates.

Note that the LAB section ends with a different '-1' line than
the other files.

An example of an actual LAB section follows:

LAB  2
         1         2 3.4046650E+05 4.1002668E+06
 3.4046650E+05 4.1002668E+06 3.4046650E+05 4.1002668E+06
         2         3 3.4048869E+05 4.1000852E+06
 3.4048869E+05 4.1000852E+06 3.4048869E+05 4.1000852E+06
        -1         0 0.0000000E+00 0.0000000E+00

An example of a double-precision LAB section follows:

LAB  3
         1         2 3.40500000000000E+05 4.10006225000000E+06
 3.40500000000000E+05 4.10006225000000E+06
 3.40500000000000E+05 4.10006225000000E+06
         2         3 3.40468812500000E+05 4.10026225000000E+06
 3.40468812500000E+05 4.10026225000000E+06
 3.40468812500000E+05 4.10026225000000E+06
        -1         0 0.00000000000000E+00 0.00000000000000E+00

3.4 LOG

The LOG (Coverage History) file contains a free form set of lines
of indeterminate number which are separated by lines which begins
with a tilde, "~".

ARC records many commands and their resource impacts in this
file.  The standard ARC format for writing in the LOG has nine
fields:

         Year (I4)
         Month (I2)
         Day (I2)
         Hours (I2)
         Minutes (I2)
         Connect Time in minutes (I4)
         CPU Time in seconds (I6)
         I/O Time in seconds (I6)
         Command line (A100)

However, any information can be added to the LOG file in free-
form format.

An example of an actual LOG section follows:

LOG  2
19940118 849   0     3    35export cover landli stdfigc none
~
19940118 850   0     7   190clean landli landlicp # # poly
~
EOL

3.5 PAL

The PAL (Polygon Topology) file consists of repeating sets of
polygon information.  The first line of each set has five
numbers:

     1.   number of arcs in polygon
     2.   x min of polygon
     3.   y min of polygon
     4.   x max of polygon
     5.   y max of polygon

The subsequent lines of a set give information on the arcs which
comprise the polygon.  There are three numbers per arc with
information for two arcs per line.

     1.   the arc number (negative if reversed)
     2.   the node number
     3.   the polygon number

The first polygon given is the universal polygon.

"The PAL file contains the polygon topology for a coverage and
min-max boxes for the polygons.  For each polygon in a coverage
the PAL file has a (usually) clockwise list of the arcs, nodes
that comprise the polygons, as well as the adjacent polygons, and
a min-max box.  To keep a continuous list, 'virtual' arcs with
arc# of 0 are used to connect to holes (thus forming donuts),
which are connected in counter-clockwise order.  The PAL file is
a random access, variable record length file, with the length
dependent on the number of arcs surrounding the polygon (1 to
10000).

The arc# in the PAL file is the record number of that arc within
the coverage's ARC file, the node# is the same as the node# in
the arc file at the appropriate end, and the polygon# is the
record number of that polygon within the coverage's PAL file. 
The PAL file record number for a polygon is the same as the PAT
file record number and the CNT file record number."  SDL
documentation, July 1989, p. 24.

An example of an actual PAL section follows:

PAL  2
         5 3.4009988E+05 4.1000000E+06 3.4090012E+05 4.1003995E+06
         0         0         0        -1         1         2
        -7         2         3        -6         5         3
        -3         4         2
         4 3.4009988E+05 4.1001995E+06 3.4090012E+05 4.1003995E+06
         1         2         1         3         1         1
         4         4         4         2         3         3