Geological Services: Geological maps arguably present some of the most complicated displays in visual clutter. The work involves vectorization of geological features as per client specification. Starting from Georeferencing input maps, the process involves vectorization, creating attributes of all geological features after assigning the appropriate projection system, and final delivery of output files. Sunram has done extensive work in the digital conversion of surficial and bedrock geological maps.

• Interpretation and data conversion of geological, topographical, soil and mineralogical maps and satellite images
• Registration, mosaicing, data attribution, creation of topology, digitization, image processing
• Geo-reference the tiff to the original map projection
• Capture structure (points)-lineation, gneissosity, schistosity, dragfolds, pillows, bedding, minor fold axis, mineral occurrences ...
• Capture line work, create polygons, capture structures(points)
• Slope analysis, digital elevation models

Geophysical Services (Well Log Digitization): Well logs present valuable information on geophysical parameters such as porosity, permeability and resistivity as well as geological interpretations of lithology. Sunram offers an efficient process for the digital conversion of well log data and consequent value addition.

• Conversion of hard copy well log data to client specific vector formats
• Scanning and Digitization, Depth Registration, Log data editing
• Output: ASCII, LIS & LAS

Construction of a new geological spatial database for a surficial geology compilation:

The objectives were to capture the data in a common database, creating a common legend and distribute the information through an easily accessible web portal. The initial phase of data capture was to (a) digitize from georeferenced scans of hard copy maps and or (b) convert older GIS formats such as AutoCAD drawings and ESRI shapefiles. The challenges involved dealing with multiple formats, different scales, maps from different authors of different vintages and having different styles.

Spatial data: Spatial data for each map is digitized or imported into one of three feature classes (point, line or polygon) in an ArcGIS geodatabase

Non-spatial data: Original terminology used for feature descriptions and polygon labels is first captured and preserved. These are then converted to standardized terminology. The standardized polygon labels are further subdivided into individual fields so that specific surficial materials, textures, surface expressions or geomorphological processes can be easily queried by the end-user. In addition, all original legends and descriptive notes are captured digitally in non-spatial tables or text files.

Quality control: Rigorous quality control measures, multiple rounds of revisions and topology checks are used at all stages of the data capture process to ensure a high quality product.

Applications: The applications of this project range from mineral exploration to forest management, land use planning, transportation studies, environmental assessments to name a few.

Images Courtesy: YGS