Hints and Tips for Batch Importing
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The
SAS/GIS batch import process provides less error checking than the
GIS
Spatial Data Importing window. Ensure that the values
that you define for the input parameters are valid. Defining invalid
values for the input parameters will cause the import to fail.
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The
GIS
Spatial Data Importing window interface lets you modify
the default composites and the default layer definitions before you
proceed with the import. The batch import process does not provide
this functionality. To modify the composites and layers before the
import occurs, you must use the
GIS Spatial Data Importing window.
However, it does not matter which method you use to complete the import.
You can always use PROC GIS after the import is complete to make changes
to your map and its underlying components.
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The batch import for the 1990 –
2006 TIGER and DYNAMAP import types does not automatically import
all of the files, only the required file types 1 and 2. To use the
batch import process to import any or all of the optional file types,
you need to perform the following steps:
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Copy the SASHELP.GISIMP
data set to a location where you have Write access. For example, copy
the SASHELP.GISIMP data set into the SASUSER library:
proc copy in=sashelp out=sasuser;
select gisimp / mt=data;
run;
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Edit the SASUSER.GISIMP
data set and change the value of the REQ variable for the TIGER or
DYNAMAP file type from 0 (zero) to 1. For example, you have the TIGER4
and TIGER5 filerefs allocated to the TIGER file types 4 and 5, and
you want them to be imported. In that case, you could run the following
DATA step to change the value of the REQ variable:
data sasuser.gisimp;
set sasuser.gisimp;
/* Make sure that the values of the
FILEREF variable are in all uppercase. */
if fileref in ('TIGER4' 'TIGER5')
then req=1;
run;
However, you could also use FSBROWSE, FSVIEW, VIEWTABLE,
or any other method that you are familiar with to change the value
of the REQ variable. Just remember that for the import type that you
choose, it will import only from the filerefs for which REQ=1 in the
data set.
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For
SAS/GIS to use the
new
SASUSER.GISIMP data set,
you must define the USER_FIL macro variable to point to the name of
the new data set. For example:
%let USER_FIL=SASUSER.GISIMP;
As
long as the USER_FIL macro variable is defined when the
SASHELP.GISIMP.BATCH.SCL entry is executed, it will use the current values
of REQ to specify which files are imported.
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The
SASHELP.GISIMP data set also contains the default librefs for the
output catalog entries and spatial data sets. You can modify these
defaults by making a copy of the
SASHELP.GISIMP data set and changing the values for the DEFMLIB and
DEFSLIB variables to a valid, assigned libref. You then need to define
the macro variable USER_FIL to point to your modified copy of the
data set.
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The data set that is specified
by the USER_FIL macro variable is used by both the batch and interactive
imports. Consider the case where you have modified a copy of the
SASHELP.GISIMP data set and assigned
the data set name to the USER_FIL macro variable. However, you do
not want to have that data set used for a specific import. You need
to redefine the USER_FIL macro variable to point to the default data
set,
SASHELP.GISIMP, before
performing either an interactive or a batch import.
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Throughout this chapter, all of
the macro variable names, their values, and all filerefs have been
shown in all uppercase for clarity. However, their names and values
are not case-sensitive. For example, the following four statements
are equivalent:
%let imp_type=sasgraph;
%let imp_type=SASGRAPH;
%let IMP_TYPE=sasgraph;
%let IMP_TYPE=SASGRAPH;
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