NEWWQ shows point locations at 1:24,000 scale of water quality sampling stations used for molluscan shellfish growing areas in Maine with pollution classifications. Samples collected from these stations are analyzed for fecal coliform contamination. Contamination data are stored in a separate database. This coverage was last reviewed and updated in January 1995. Data was compiled on a 1:24000 base from paper maps by Maine Department of Marine Resources staff.
NEWWQ was created to provide point locations of water quality sampling stations used for molluscan shellfish growing areas classification. Samples collected from these stations provide contamination data for a related database at MEDMR. Not recommended for use at scales greater than 1:24000. Data at this scale is suitable for use in detailed studies and local planning.
Users must assume responsibility in determining the usability of this data for their purposes. Digital maps retain the accuracy of their source materials. The best use of data mapped at scales of 1:500,000 and 1:250,000 is in statewide planning and studies; at 1:100,000 in regional planning and studies; at 1:62,500 and 1:24,000 in detailed studies and local planning; and at 1:12,000 and 1:5,000 or larger scales in parcel level studies and detailed local planning. In the use of Maine GIS data, please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the most recent copy of both data and metadata from the Maine GIS Data Catalog. The Maine Office of Geographic Information Systems (MEGIS) provides notice of updates and corrections directly to the Maine GIS Technical Group and Maine GIS Users, through the MEGISTECH and MEGISUSER list servers. To subscribe please contact the MEGIS technical support line at (207) 287-6144. To request data correction in, or provide updates to, Maine GIS data a feedback form is available at http://megis.maine.gov/, or you may contact MEGIS directly. MEGIS is not responsible for local edits to data or metadata. Updates, corrections, and feedback, incorporated in the Maine GIS database are made in accordance with "Data Standards for Maine Geographic Information Systems", 2002, and coordinated by MEGIS in consultation with the Maine GIS Executive Council.
State House Station 145
Credit should always be given to the data source and/or originator when the data is transferred or printed.
Attribute accuracy is tested by manual comparison of the source with hard copy printouts and/or symbolized display of digital files. Please report errors to Maine Office of GIS.
The coverage has been BUILT to POINT. All points have a single unique user-id.
Data set is complete.
Approximate horizontal accuracy is 12 meters assuming compilation base meets National Map Accuracy Standards.
NEWWQ shows point locations at 1:24,000 scale of water quality sampling stations used for molluscan shellfish growing areas in Maine with pollution classifications. Samples collected from these stations are analyzed for fecal coliform contamination. Contamination data are stored in a separate database. This coverage was last reviewed and updated in January 1995. Data was compiled on a 1:24000 base from paper maps by Maine Department of Marine Resources staff. data was compiled by screen digitizing point locations on a 1:24000 scale base.
PO Box 8
The Maine Office of GIS completed the conversion of all final data layers from NAD27 to NAD83 in July 1999. All the data layers were converted using the ArcInfo (version 7.2.1) NADCON conversion and the "project" command. All data was copied to double precision, projected to NAD83, and then copied back to single precision. It was decided to keep the NAD27 quad structure instead of generating new quad boundaries from NAD83 coordinates - all indexes (quads) were projected to NAD83 by using the same process previously described. All MEGIS data libraries in ArcInfo Librarian were repopulated using the NAD83 indexes and data.
State House Station 145
feature identification number
default Arc/Info user defined
Internal feature number.
NEWWQ contains point locations of water quality sampling stations and is coded with the item STATION which contains the STATION-ID. This item is used at MDMR to relate mapped locations to a database of additional attributes.
State House Station 145
Users must assume responsibility to determine the usability of this data for their purposes. Although these data have been processed successfully on a computer system at the Maine Office of Geographic Information Systems, no warranty expressed or implied is made by MEGIS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Neither the Maine Office of Geographic Information Systems, nor any of its contributors, is liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets.
ARC/INFO Export Format
An Arc/Info export file is an interchange format used to transfer spatial data, INFO data files, and other ESRI ARC/INFO files between various machine types. Export files have the suffix .e00 and contain, in fixed-length ASCII format, all spatial information available for each feature. The command IMPORT is available in A/I to convert the export file to original format, i.e. coverage, grid, or other spatial data file. Import will add a spatial data file and a related INFO file to a machine directory. ESRI's ArcView is packaged with an import utility called IMPORT71 for the same export file conversion. The utility is also available through the FREE software link on the Maine GIS Internet Data Catalog under "CDProducts" at http://megis.maine.gov/catalog/ or from ESRI at http://www.esri.com/. CARE MUST BE TAKEN after import, not to separate the spatial information from its related INFO file. Since export files are in ASCII format make sure any file transfer method like FTP is executed under ASCII mode. Binary transfer may not work correctly.
ArcView Shapefile Format
MEGIS has made some data, in the Internet Data Catalog, available in ESRI's ArcView shapefile format. This additional format is available for E911RDS and WETCHAR data under the TOWNS tab. A shapefile is a simple non-topological format that stores the geometry and attribute information for a set of geographic features as a set of vector (point, line, polygon) coordinates. Shapefiles draw quickly and directly in ArcView; you can create your own data using the shapefile format; an existing ARC/INFO coverage can be converted to a shapefile; other spatial data formats can be converted to shapefiles. Three files are created for each shapefile: .shp stores the feature geometry (shape and location information); .shx stores the index of the feature geometry; .dbf a dBASE (TM) file stores the attribute information for the features. Other index files may be created to help speed analysis and query: these file formats are .sbn .sbx .ain .aix .fbn and .fbx. In addition you may find projection .prj, and metadata .xml, files associated with shapefiles. CAUTION: When you edit an existing theme or shapefile you are creating a new dataset or at least a new version of a dataset; give the dataset a new name or a version identifier to reflect your edits. Be prepared to fully document your sources and to both quantify and qualify the edits you make in order to facilitate coordination with other data sources. PLEASE NOTE: conversion to shapefile format changes some characters ( # - .) to underscores; item names over 10 characters are truncated. An effort will be made over time to consider these limitations in item names, and to eliminate the use of these characters in Maine GIS data development. It should not be assumed that a conversion from shapefile back to coverage would produce the same data file as found in the original coverage format. The results of such a conversion are greatly improved by the use of PRECISION setting DOUBLE, DOUBLE and careful management of tolerances.
MEGIS provides technical support for Maine GIS data, estimates on custom mapping, and consultation on data and application development, as time permits. You may call (207) 287-6144 with questions about Maine GIS data, and to inquire about assistance with your GIS environment.
State House Station 145