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GIS
Metadata
This information is presented to identify the data sources and digitizing
methods used to create 1978 shapefiles. These shapefiles then became the
basis for updated 2000 mapping, modified by field data and additional
sources.
ELECTRICITY LINES
- Data Source Information
Method of Digital Input: Heads-up digitizing using ArcView 3.2, based on a 300-dpi scan of original map.
Electricity lines (all of 34.5 Kv) were digitized from two different maps.
Electricity lines north of latitude 27 45 N were digitized from:
Carta Geologica
G14A17 Villa Hidalgo - E.U.M. Coahuila Y Nuevo Leon, E.U.A. Texas.
Date of Original Map (First Edition): 1979
Scale of Original Map: 1:50,000
Projection of Original Map: Appears to have been created from aerial photographs, as there is a note in the legend section that indicates a date of flight (1976).
Electricity lines south of latitude 27 45 N were digitized from:
Carta de Uso del Suelo y Vegetacion
G14A27 Colombia - E.U.M. Tamaulipas y Coahuila, E.U.A. Texas.
Date of Original Map (First Edition): 1982
Scale of Original Map: 1:50,000
Projection of Original Map: Based on aerial photointerpretation and field verification. Flight is dated 1977.
Information on electricity lines was to be extracted from the geology maps (Carta Geologica). However, a geology map of the southern region of study was not available, and therefore we relied on the information found in the vegetation map (Carta de Uso de Suelo y Vegetacion).
Both maps were produced by the same publishing agency:
Secretaria de Programacion y Presupuesto
Coordinacion General de Sistema Nacional de Informacion
Direccion General de Estudioes del Territorio Nacional
Estados Unidos Mexicanos
ROADS - Data Source Information
Method of Digital Input: Heads-up digitizing using ArcView 3.2, based on a 300-dpi scan of original map.
Roads (including paths) were digitized from two different maps.
Roads north of latitude 27 45 N were digitized from:
Carta Geologica
G14A17 Villa Hidalgo - E.U.M. Coahuila Y Nuevo Leon, E.U.A. Texas.
Date of Original Map (First Edition): 1979
Scale of Original Map: 1:50,000
Projection of Original Map: Appears to have been created from aerial photographs, as there is a note in the legend section that indicates a date of flight (1976).
Roads south of latitude 27 45 N were digitized from:
Carta de Uso del Suelo y Vegetacion
G14A27 Colombia - E.U.M. Tamaulipas y Coahuila, E.U.A. Texas.
Date of Original Map (First Edition): 1982
Scale of Original Map: 1:50,000
Projection of Original Map: Based on aerial photointerpretation and field verification. Flight is dated 1977.
Information on roads was to be extracted from the geology maps (Carta Geologica). However, a geology map of the southern region of study was not available, and therefore we relied on the information found in the vegetation map (Carta de Uso de Suelo y
Vegetacion).
Both maps were produced by the same publishing agency:
Secretaria de Programacion y Presupuesto
Coordinacion General de Sistema Nacional de Informacion
Direccion General de Estudioes del Territorio Nacional
Estados Unidos Mexicanos
Publisher's Address:
Direccion General de Estudios del Territorio Nacional
San Antonio Abad No. 124, C.P. 8
Mexico D.F., MEXICO
TELEGRAPH LINES - Data Source Information
Method of Digital Input: Heads-up digitizing using ArcView 3.2, based on a 300-dpi scan of original map.
Telegraph lines were digitized from two different maps. At the time of their printing, the telegraph lines were no longer in use.
Telegraph lines north of latitude 27 45 N were digitized from:
Carta Geologica
G14A17 Villa Hidalgo - E.U.M. Coahuila Y Nuevo Leon, E.U.A. Texas.
Date of Original Map (First Edition): 1979
Scale of Original Map: 1:50,000
Projection of Original Map: Appears to have been created from aerial photographs, as there is a note in the legend section that indicates a date of flight (1976).
Telegraph line south of latitude 27 45 N were digitized from:
Carta de Uso del Suelo y Vegetacion
G14A27 Colombia - E.U.M. Tamaulipas y Coahuila, E.U.A. Texas.
Date of Original Map (First Edition): 1982
Scale of Original Map: 1:50,000
Projection of Original Map: Based on aerial photointerpretation and field verification. Flight is dated 1977.
Information on telegraph lines was to be extracted from the geology maps (Carta Geologica). However, a geology map of the southern region of study was not available, and therefore we relied on the information found in the vegetation map (Carta de Uso de Suelo y
Vegetacion).
Both maps were produced by the same publishing agency:
Secretaria de Programacion y Presupuesto
Coordinacion General de Sistema Nacional de Informacion
Direccion General de Estudioes del Territorio Nacional
Estados Unidos Mexicanos
Publisher's Address:
Direccion General de Estudios del Territorio Nacional
San Antonio Abad No. 124, C.P. 8
Mexico D.F., MEXICO
VEGETATION - Data Source Information
Method of Digital Input: Heads-up digitizing using ArcView 3.2, based on a 300-dpi scan of original map.
The vegetation was digitized from two different maps.
Vegetation north of latitude 27 45 N was digitized from:
Carta de Uso del Suelo y Vegetacion
G14A17 Villa Hidalgo - E.U.M. Coahuila Y Nuevo Leon, E.U.A. Texas.
Date of Original Map (First Edition): 1982
Scale of Original Map: 1:50,000
Projection of Original Map: Based on aerial photointerpretation and field verification. Flight is dated 1977.
Electricity lines south of latitude 27 45 N were digitized from:
Carta de Uso del Suelo y Vegetacion
G14A27 Colombia - E.U.M. Tamaulipas y Coahuila, E.U.A. Texas.
Date of Original Map (First Edition): 1982
Scale of Original Map: 1:50,000
Projection of Original Map: Based on aerial photointerpretation and field verification. Flight is dated 1977.
Both maps were produced by the same publishing agency:
Secretaria de Programacion y Presupuesto
Coordinacion General de Sistema Nacional de Informacion
Direccion General de Estudioes del Territorio Nacional
Estados Unidos Mexicanos
SOILS - Data Attribute Information
Fields:
1. Primary = primary soil type
2. Secondary = secondary soil type
3. Texture = soils texture
4. ChemPhase = chemical phase of the soil
5. PhysPhase = physical phase of the soil
SOILS - Data Source Information
--Northern Segment of Study
Area--
Publishing Agency: Secretaria de Programacion y Presupuesto, Coordinacion General de Sistema Nacional de Informacion, Direccion General de Estudioes del Territorio Nacional, Estados Unidos Mexicanos
Publisher Address: Direccion General de Estudios del Territorio Nacional, San Antonio Abad No. 124 Mexico 8,
D.F.
Original Map Name: G14A17 Villa Hidalgo - E.U.M. Coahuila Y Nuevo Leon,
E.U.A. Texas
Date of Original Map: June 1978
Scale of Original Map: 1:50,000
Projection of Original Map: created from aerial photographs
Method of Digital Input: heads-up digitizing using ArcView 3.2, based on a 300-dpi scan of original map
--Southern Segment of Study
Area--
Publishing Agency: Secretaria de Programacion y Presupuesto, Coordinacion General de Sistema Nacional de Informacion, Direccion General de Estudioes del Territorio Nacional, Estados Unidos Mexicanos
Publisher Address: Direccion General de Estudios del Territorio Nacional, San Antonio Abad No. 124 Mexico 8,
D.F.
Original Map Name: G14A27 Colombia - E.U.M. Coahuila Y Nuevo Leon,
E.U.A. Texas
Date of Original Map: June 1978
Scale of Original Map: 1:50,000
Projection of Original Map: created from aerial photographs
Method of Digital Input: heads-up digitizing using ArcView 3.2, based on a 300-dpi scan of original map
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