This CD-ROM contains a digital version of aggregate resources information originally published by the Colorado Geological Survey as Special Publications 5-A and 5-B by Schwochow, Shroba, and Wicklein in 1974. The original atlas information was published as 212 individual quadrangles, however, this dataset has been panelled. The dataset extent ranges from the Wyoming/Colorado state line southward along the Front Range to Pueblo, Colorado and from the foothills west of Denver and Colorado Springs to approximately the eastern edges of Weld, Douglas, El Paso, and Pueblo counties. The CD also contains text files of explanatory notes and quadrangle names. Datasets clipped to the county boundaries, the individual county boundaries, and a dataset containing the quadrangle and project boundaries are also included.
Conversion of the atlas to digital form was done to aid in the cataloging of aggregate resources along the Front Range of Colorado as part of the Front Range Infrastructure Resources Project (FRIRP). This dataset can be used alone but will probably be most useful in a geographic information system or decision support system. The dataset should be useful to aggregate producers, land use planners, environmental groups, biologists, and land owners, etc... The original data compilation was done at 1:24,000 and reduced to 1:75,000 in the 5-B publication and reduced to 1:250,000 in the 5-A publication; the aggregate data should not be used for analysis at a scale any larger than 1:24,000.
The following represents a list of all aggregate datasets on the CD-ROM: frir_agg - panelled net coverage, lines and areas with label points West Bounding Coordinate: -106.01842755 East Bounding Coordinate: -103.56788683 North Bounding Coordinate: 41.00603478 South Bounding Coordinate: 37.86705931 frir_aggx - panelled point coverage West Bounding Coordinate: -105.95149503 East Bounding Coordinate: -103.58992347 North Bounding Coordinate: 40.99842681 South Bounding Coordinate: 37.86940928 adaag - net coverage clipped to Adams county West Bounding Coordinate: -105.05364773 East Bounding Coordinate: -104.02057555 North Bounding Coordinate: 40.00383221 South Bounding Coordinate: 39.73525649 adaagx - point coverage clipped to Adams county West Bounding Coordinate: -105.05221286 East Bounding Coordinate: -104.18757313 North Bounding Coordinate: 39.99969653 South Bounding Coordinate: 39.74151893 araag - net coverage clipped to Arapahoe county West Bounding Coordinate: -105.05437893 East Bounding Coordinate: -104.01307782 North Bounding Coordinate: 39.74344799 South Bounding Coordinate: 39.56191127 araagx - point coverage clipped to Arapahoe county West Bounding Coordinate: -105.0531223 East Bounding Coordinate: -104.04882132 North Bounding Coordinate: 39.73807191 South Bounding Coordinate: 39.5638072 bouag - net coverage clipped to Boulder county West Bounding Coordinate: -105.60819021 East Bounding Coordinate: -105.05455222 North Bounding Coordinate: 40.26150201 South Bounding Coordinate: 39.91231192 bouagx - point coverage clipped to Boulder county West Bounding Coordinate: -105.59693577 East Bounding Coordinate: -105.05791288 North Bounding Coordinate: 40.26080903 South Bounding Coordinate: 39.92409375 cusag - net coverage clipped to Custer county West Bounding Coordinate: -105.12573916 East Bounding Coordinate: -105.06027224 North Bounding Coordinate: 38.12143162 South Bounding Coordinate: 37.98912702 cusagx - point coverage clipped to Custer county West Bounding Coordinate: -105.12573916 East Bounding Coordinate: -105.06027224 North Bounding Coordinate: 38.12143162 South Bounding Coordinate: 37.98912702 denag - net coverage clipped to Denver county West Bounding Coordinate: -105.08164148 East Bounding Coordinate: -104.60610603 North Bounding Coordinate: 39.91463682 South Bounding Coordinate: 39.62766893 denagx - point coverage clipped to Denver county West Bounding Coordinate: -105.08162621 East Bounding Coordinate: -104.62610467 North Bounding Coordinate: 39.87165659 South Bounding Coordinate: 39.62865697 douag - net coverage clipped to Douglas county West Bounding Coordinate: -105.221721 East Bounding Coordinate: -104.66079793 North Bounding Coordinate: 39.56614029 South Bounding Coordinate: 39.1291703 douagx - point coverage clipped to Douglas county West Bounding Coordinate: -105.0939017 East Bounding Coordinate: -104.67928366 North Bounding Coordinate: 39.56318729 South Bounding Coordinate: 39.131878 elpag - net coverage clipped to El Paso county West Bounding Coordinate: -105.02849121 East Bounding Coordinate: -104.04589301 North Bounding Coordinate: 39.13016572 South Bounding Coordinate: 38.51647848 elpagx - point coverage clipped to El Paso county West Bounding Coordinate: -104.93416363 East Bounding Coordinate: -104.06612966 North Bounding Coordinate: 39.12900577 South Bounding Coordinate: 38.52151385 gilag - net coverage clipped to Gilpin county West Bounding Coordinate: -105.62587664 East Bounding Coordinate: -105.42447604 North Bounding Coordinate: 39.93815138 South Bounding Coordinate: 39.89914119 gilagx - point coverage clipped to Gilpin county West Bounding Coordinate: -105.60590305 East Bounding Coordinate: -105.4596678 North Bounding Coordinate: 39.92237039 South Bounding Coordinate: 39.90250038 hueag - net coverage clipped to Huerfano county West Bounding Coordinate: -104.93235345 East Bounding Coordinate: -104.86451445 North Bounding Coordinate: 37.88920933 South Bounding Coordinate: 37.87494477 hueagx - point coverage clipped to Huerfano county West Bounding Coordinate: -104.92110188 East Bounding Coordinate: -104.86450876 North Bounding Coordinate: 37.88762133 South Bounding Coordinate: 37.877054 jefag - net coverage clipped to Jefferson county West Bounding Coordinate: -105.3758565 East Bounding Coordinate: -105.04852806 North Bounding Coordinate: 39.91447501 South Bounding Coordinate: 39.25930981 jefagx - point coverage clipped to Jefferson county West Bounding Coordinate: -105.25611913 East Bounding Coordinate: -105.05496282 North Bounding Coordinate: 39.91321383 South Bounding Coordinate: 39.48968604 larag - net coverage clipped to Larimer county West Bounding Coordinate: -106.01829168 East Bounding Coordinate: -104.94297781 North Bounding Coordinate: 41.00169164 South Bounding Coordinate: 40.25683989 laragx - point coverage clipped to Larimer county West Bounding Coordinate: -105.95052027 East Bounding Coordinate: -104.94416017 North Bounding Coordinate: 40.93443543 South Bounding Coordinate: 40.36015857 pueag - net coverage clipped to Pueblo county West Bounding Coordinate: -105.05047481 East Bounding Coordinate: -104.05134821 North Bounding Coordinate: 38.52619917 South Bounding Coordinate: 37.88215246 pueagx - point coverage clipped to Pueblo county West Bounding Coordinate: -105.04268268 East Bounding Coordinate: -104.05482619 North Bounding Coordinate: 38.51135313 South Bounding Coordinate: 37.88809388 telag - net coverage clipped to Teller county West Bounding Coordinate: -105.10508444 East Bounding Coordinate: -105.0272037 North Bounding Coordinate: 39.12971417 South Bounding Coordinate: 38.98325667 telagx - point coverage clipped to Teller county West Bounding Coordinate: -105.95052027 East Bounding Coordinate: -104.94416017 North Bounding Coordinate: 40.93443543 South Bounding Coordinate: 40.36015857 welag - net coverage clipped to Weld county West Bounding Coordinate: -105.05620403 East Bounding Coordinate: -103.56788682 North Bounding Coordinate: 41.01052087 South Bounding Coordinate: 39.99151014 welagx - point coverage clipped to Weld county West Bounding Coordinate: -105.05337111 East Bounding Coordinate: -103.58992347 North Bounding Coordinate: 41.00234152 South Bounding Coordinate: 39.99279068 The following ascii text files are also included on the CD-ROM: agg_notes.txt - listing of textual notes with associated quadrangles agg_names.txt - listing of current and historical quadrangle names and counties The datasets contained on this CD-ROM, with the exception of the text files, must be converted from Arc/INFO v.7 EXPORT format (file extension .e00). The Spatial_Data_Organization_Information is given for the two project-sized datasets: frir_agg and frir_aggx, the first listing refers to frir_agg, the second to frir_aggx.
ground condition
Acknowledgement of the Colorado Geological Survey and the U.S. Geological Survey would be appreciated.
1313 Sherman St., Room 715
Joseph M. Sadlik USGS-NMD, Denver, CO David W. Litke USGS-WRD, Denver, CO Maria L. McCormick USGS-NMD, Denver, CO Chris Hiatt Student Assistant, USGS-WRD, Denver, CO Carol S. Mladinich USGS-NMD, Denver, CO Stewart M. Wright USGS-NMD, Denver, CO Jim Cappa Colorado Geological Survey, Denver, CO William H. Langer USGS-NMD, Denver, CO Heike Streibeck Student Assistant, Fachhochscule, Karlsruhe, Germany
Linework was scanned from original 1:24,000-scale, stable-base project maps provided by the Colorado Geological Survey. The data was vectorized and imported into Arc/INFO v.7.0.4 where attributes were assigned to polygons, lines, and points. The individual quadrangle datasets were panelled together for a demonstration area (a 45-quad area generally encompassing the Denver metro area) and for the remaining quadrangles, then panelled into the final dataset. Where possible, all information was replicated from the atlas by Schwochow, Shroba, and Wicklein though attribute and resource delineation inconsistencies were encountered along some of the quadrangle boundaries. Most of these inconsistencies were resolved through discussions with the Colorado Geological Survey. Where the original Special Publication 5-B indicated that 212 7.5-minute quadrangles were mapped, actually, the area encompasses 239 quadrangles, after the general highway maps are divided into 7.5-minute quadrangles. No updated information has been added to the dataset.
This dataset replicates the information on the original atlas by Schwochow, Shroba, and Wicklein, though attribute and delineation inconsistencies are present. Most of these types of inconsistencies were resolved though discussions with the Colorado Geological Survey. On the original atlas, textual notes appear highlighting a unique characteristic of a particular resource. Generally, the note refers to a discreet polygon, line, or point. In some cases, the note does not relate to a specific polygon. An example is the note AR01,"Valley fill along Middle St. Vrain Creek probably contains local deposits of sand and gravel". The area is not explicitly identified so the note has been placed as near as possible to the position on the original map. There are eleven such occurences, and all refer to polygons. In other cases, it was difficult to determine the extent of influence of a note. In these cases, an additional line was added to create a new polygon containing the note. Topology is present on all the aggregate coverages. The data was reviewed several times during the course of compilation by reviewing the data online and reviewing check plots to ensure data completeness and continuity.
The dataset replicates the areal extent of the atlas by Schwochow, Shroba, and Wicklein. An attribute scheme was developed based on the information shown in the original atlas. Additional attributes were developed to more completely portray areas implicitly shown on the atlas, but not directly translated to digital form. For example, attributes were developed to indicate bedrock polygons, unattributed polygons, and unattributed lines. Individual attributes were developed for properties identified on each sample point location, such as overburden thickness, rather than retaining the implicit grouping of the information as shown on the original atlas.
Accuracy of this dataset is directly related to the accuracy of the original 1:24,000-scale stable-base materials. Plots were used to visually compare the vectorized coverages against the orignal stable-base materials. During the conversion to a digital coverage, decisions were made regarding minor join problems and unattributed polygons shown on the original materials. Mapping scale and methods used to compile the data are factors that require careful consideration when determining how to use the data. Refer to the original publications 5-A and 5-B for specific information on how the original data was mapped.
The aggregate data presented on this CD-ROM were produced by scanning the original stable-base materials used in the creation of the Atlas.
Data was collected from original 1:24,000-scale, stable-base (master) project maps provided by the Colorado Geological Survey. These maps were scanned at 800 dpi using an Anatech Eagle 4080 scanner. The resulting raster images were imported into Pacer-Infotec's LT4X software and edited and vectorized. The vector data was exported as AutoCad DXF-format files, and imported into Arc/INFO v. 7.0.4 using the DXFARC command. Line, area, and point information was attributed using Arcedit command and using the master project maps as references.
The dataset was panelled three times: first into the 45-quadrangle Denver-area demonstration area, second, the remaining 194 quadrangles, and third, the demonstration area and the outer project area were panelled together. Positions of the area label points and the textual notes were adjusted where necessary to remove multiple label points and to clarify a particular note's influence. Adjustment of the notes was also done to the lines and points.
A listing of all notes occurring in the Atlas, agg_notes.txt, was created and contains a reference code used as an attribute in the dataset, i.e., AR06, LN05, PT07, the textual note, and a list of the quadrangles to which the note applies. A listing of quadrangles in the Atlas, agg_names.txt, was created. Many of the quadrangle names have been changed since the Atlas was published in 1974. The list provides the current quadrangle name as listed in GNIS (Geographic Names Information System) as of May 1998, the historical/alternate name as shown in the Atlas, and the county in which the quadrangle is located, with the primary county listed first. Where no historical name exists, the letter "Z" is used as a placeholder.
As a final step, the coverages were clipped using county coverages created from the 1:2,000,000 state digital line graph. The FRIR project covers all or parts of fourteen counties. The clipping tolerance used was 1.219 meters.
The data was reviewed several times to ensure completeness, and correctness. Several iterations of checkplots were created for review purposes during initial collection and after the 239 individual quadrangles were panelled into the final dataset.
First draft of metadata created by Maria L. McCormick using FGDCMETA.AML ver. 1.2 05/14/98 on ARC/INFO data set /data5/maria/frir_agg and /data5/maria/frir_aggx. The FGDCMETA.AML was used on the county-clipped net and point coverages to obtain their spatial extents. The attribute information is the same as the two final datasets, frir_agg and frir_aggx.
The items unique to Arc/INFO will be ignored in the descriptions of the attributes. Attribute listings for frir_agg (net coverage): > >FRIR_AGG.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 FRIR_AGG# 4 5 B - > 21 FRIR_AGG-ID 4 5 B - > 25 LFUNIT 1 1 C - > 26 RCLASS 1 1 I - > 27 NOTE 6 6 C - > 33 COMMENT 30 30 C - > ** REDEFINED ITEMS ** > 25 RCODE 2 2 C - > LFUNIT = landform unit F = floodplain deposit T = stream terrace deposit V = valley fill (floodplain and/or terrace deposits) U = upland deposits A = alluvial fan E = eolian sand (wind-deposited) M = man-made deposits (slag, tailings, spoils...) R = potential quarry aggregate resource O = other, includes conglomerates Z = not mapped RCLASS = resource class 0 = originally unlabelled/unkown 1 = gravel; relatively clean and sound 2 = gravel; significant fines, decomposed rock, calcium carbonate 3 = sand 4 = probable aggregate resource 5 = carbonate rocks 6 = volcanic rocks 7 = intrusive igneous rocks 8 = metamorphic rocks (including quartzite) 9 = other NOTE = textual note reference, i.e., AR05; refer to the text file agg_notes.txt for the note content. The "AR" indicates the note refers to an area; "Z is used as a placeholder. COMMENT = not used in the area file, "Z" is used as a placeholder RCODE = combination of LFUNIT and RCLASS > >FRIR_AGG.AAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 FNODE# 4 5 B - > 5 TNODE# 4 5 B - > 9 LPOLY# 4 5 B - > 13 RPOLY# 4 5 B - > 17 LENGTH 8 18 F 5 > 25 FRIR_AGG# 4 5 B - > 29 FRIR_AGG-ID 4 5 B - > 33 CONTACT 2 2 I - > 35 NOTE 6 6 C - > 41 COMMENT 30 30 C - > 71 SOURCE 5 5 C - > CONTACT = boundary between landform units and/or resource classes 1 = definite, known/observed (solid) 2 = approximate (dashed) 3 = inferred, buried (dotted) 4 = neatline (used for delineation of resource areas that end at a county boundary) 5 = unattributed line, used for clarification of textual notes NOTE = textual note reference, i.e., LN05; refer to the text file agg_notes.txt for the note content. The "LN" indicates the note refers to a line; "Z" is used as a placeholder. COMMENT = not used in the line file; "Z" is used as a placeholder SOURCE = a reference to the compiler of a feature; "Z" is used as a placeholder Attribute listings for frir_aggx (point coverage): > >FRIR_AGGX.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 FRIR_AGGX# 4 5 B - > 21 FRIR_AGGX-ID 4 5 B - > 25 TYPE 1 1 C - > 26 STAT_74 1 1 C - > 27 RESFT 4 4 I - > 31 RQ 5 5 C - > 36 RESTYPE 4 4 C - > 40 OVBFT 4 4 I - > 44 OQ 5 5 C - > 49 FINES 1 1 C - > 50 PCT_FINES 3 3 I - > 53 WEAK_RX 1 1 C - > 54 CACO3 1 1 C - > 55 NOTE 6 6 C - > 61 COMMENT 30 30 C - > ** REDEFINED ITEMS ** > 25 RCODE 2 2 C - TYPE = type of sample site D = drill hole P = sand/gravel pit S = sample site Q = quarry Z = no value shown, placeholder STAT_74 = operational status in 1974 O = operating A = abandoned Z = no value shown, placeholder RESFT = resource thickness in feet RQ = resource qualifier; supplemental information relating to the resource thickness RESTYPE = resource type S = sand G = gravel X = unevaluated or unkown property Z = no value shown, placeholder OVBFT = overburden thickness in feet OQ = overburden qualifier; supplemental information relating to the overburden thickness FINES = indicates presence of fine material in the deposit A = absent or insignificant amounts S = significant amount of fines (passing through a no. 200 screen, 0.0059 in., or 0.074 mm) X = unevaluated or unknown property Z = no value shown, placeholder PCT_FINES = percent sand and fines (passing no. 4 screen, 0.25 in.), visual estimation WEAK_RX = indicates presence of weak or incompetent material in the deposit A = absent or insignificant amounts S = significant amount present X = unevaluated or unknown property Z = no value shown, placeholder CACO3 = indicates presence of calcium carbonate in the deposit A = absent or insignificant amounts S = significant amount present X = unevaluated or unknown property Z = no value shown, placeholder NOTE = textual note reference, i.e., PT05; refer to the text file agg_notes.txt for the note content. The "PT" indicates the note refers to a point; "Z" is used as a placeholder. COMMENT = additional information about the sample site, drill hole, quarry... A "WG" denotes Colorado Geological Survey/Windsor Sand and Gravel projects' drill hole RCODE = combination of TYPE and STAT_74
For an overview of the attribute information in the Atlas, see "Sand, Gravel, and Quarry Aggregate Resources-Colorado Front Range Counties" by S.D. Schwochow, R.R. Shroba, and P.C. Wicklein published by the Colorado Geological Survey as Special Publication 5-A in 1974. For attributes that were added to facilitate representation as a digital file, see the Entity_and_Attribute_Overview above.
1313 Sherman St., Room 715
This Compact Disc-Read Only Memory (CD-ROM) publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government, or any agency thereof. Although all data and software published on this CD-ROM have been used by the United States Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials. Graphical map depictions of the data are intended to be used within the map scale limits applicable to the source data. Although software enables the user to show images of the data at various scales, the user is cautioned to refer to the source documentation for the appropriate map scale limitations.
Front Range infrastructure aggregate resources geographic features
Front Range infrastructure aggregate resources geographic features
ArcIMS Image Map Service
A web-based interactive mapping system that accesses an ArcIMS Map Service running on certmapper.cr.usgs.gov.
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