Digital (GIS) Data

Many of the published ISGS IGQ and IPGM geologic quadrangle maps are available in digital (GIS) data format. A zip file linked to each of the following maps contains GIS files, metadata, supporting documentation, and graphic files for viewing. See the contents description below.

(BG = Bedrock Geology; G = Geology)

(IGQ = Illinois Geologic Quadrangle Map; IPGM = Illinois Preliminary Geologic Map)

Quadrangle	Theme	Series		Quadrangle	Theme	Series
Ava	BG	IPGM		Mt. Pleasant	BG	IGQ
Bandana	G	IGQ		Murphysboro	BG	IPGM
Bethalto	BG	IPGM		New Athens West	G	IPGM
Brownfield	BG	IGQ		Olmsted	G	IGQ
Cairo	G	IGQ		Oraville	BG	IPGM
Carrier Mills	BG	IGQ		Paducah NE	BG	IGQ
Crab Orchard	BG	IGQ		Pittsburg	BG	IGQ
Crab Orchard Lake	BG	IGQ		Pomona	BG	IPGM
Cypress	G	IGQ		Prairie du Rocher	BG	IPGM
Elsah	BG	IGQ		Prairietown	BG	IPGM
Fishhook	BG	IPGM		Pulaski	G	IPGM
Freeburg	BG	IPGM		Raddle	BG	IPGM
Harrisburg	BG	IPGM		Red Bud	G	IPGM
Herrin	BG	IGQ		Rockwood	BG	IPGM
Johnston City	BG	IGQ		Vergennes	BG	IPGM
Joppa	G	IGQ		Vienna	BG	IPGM
Karnak	G	IGQ		Welge	BG	IGQ
Kellerville	BG	IPGM		Willisville	BG	IPGM
Marion	BG	IGQ

List of Distribution File Contents

The downloadable distribution file (zip) may contain any of the following:

README.htm … description of contents

Data Files
[filename].mdb … ArcGIS geodatabase in MS Access format
[filename].pmf … ArcReader map document
Isgs_Gmdm_[ver].style … ArcGIS map symbol definition
[filename].pdf … Full-scale rendition of published hardcopy map
[filename]_report.pdf … Report that accompanied published hardcopy map
metadata.htm … Description of the data in FGDC metadata form

Data Dictionary Files
Isgs_Gmdm_Catalog_Tree_[ver].pdf … ArcCatalog view of geodatabase contents
Isgs_Gmdm_Map_Feature_Examples_[ver].pdf … Examples of map features by feature class
Isgs_Gmdm_Data_Object_List_[ver].pdf … Short list of geodatabase contents
Isgs_Gmdm_Data_Object_Desc_[ver].pdf … Detailed list of geodatabase contents
Isgs_Gmdm_Field_Defs_Short_[ver].pdf … Short list of field definitions
Isgs_Gmdm_Field_Defs_[ver].pdf … Detailed list of field definitions
Isgs_Gmdm_Domain_Defs_[ver].pdf … Domain definitions

Note: [ver] = version number of the ISGS geologic map data model (GMDM) that was current when the files were created.

Technical Requirements
The data are intended for use with GIS software. The ISGS uses ESRI ArcGIS software, however, ESRI formats can be imported into many different GIS software packages. It is expected that customers who obtain these data have the technical expertise to use GIS software. Th ISGS does not provide software support of any kind.

The ArcReader file (*.pmf) provides an interactive map that can be used to browse the data. It requires ArcReader 9.3, which can be downloaded free of charge from www.esri.com.

Updated 10/5/2009 JKH