Lineaments of Kodaikanal-Palani massif, Southern Granulitic Terrain of Tamil Nadu, India: a study using SRTM DEM and LANDSAT satellite’s OLI sensor’s FCC

Figures & data

Figure 1. Study area. Source: Information Obtained from Survey of India Open Series Map.

Figure 2. Administrative divisions. Source: Compiled information obtained from Survey of India Open Series Map and Taluk map published by Government of Tamil Nadu.

Figure 3. Rock types. Source: Information obtained from published geology map by Geological Survey of India.

Table 1. Rock types of the study area and their areal extent.

Sl. No.	Rock types	Area (in sq. km)	Area (in %)
(1)	Aeolian sands	2.83	0.17
(2)	Laterite	1.76	0.10
(3)	Calcareous mud and clay	3.84	0.23
(4)	Basic dyke	0.86	0.05
(5)	Granite gneiss	5.72	0.34
(6)	Anorthosite	6.06	0.36
(7)	Granite	27.20	1.62
(8)	Hornblende biotite gneiss	192.55	11.44
(9)	Charnockite	1441.79	85.67
(10)	Calc. granulite	0.26	0.02
Total		1682.87	100.00

Figure 5. Lineaments extracted from Lansat OLI. Source: From Landsat 8 Satellite's OLI Sensor obtained from Online Resources.

Figure 6. Final output. Source: Generated both from SRTM and Landsat 8 OLI satellite images.

Table 2. Total number of lineaments in SRTM DEM image.

Sl. No.	Angles (in degrees)	SRTM DEM
		Total numbers	Total length (in km)
(1)	45	701	881.52
(2)	90	398	701.62
(3)	135	400	687.57
(4)	180	436	744.59
(5)	225	363	585.99
(6)	270	464	621.81
(7)	315	372	627.57
(8)	360	414	614.41
(9)	Merged	1351	1820.05

Table 3. Lineament density classes and their areal extent.

Lineament density
Sl. No.	Range (km/sq. km)	Density class	Area (in sq. km)	Area (in %)
(1)	<1	Low	223.95	13.31
(2)	1−2	Moderate	1023.82	60.84
(3)	>2	High	435.10	25.85
Total			1682.87	100.00

Figure 7. Lineament density. Source: Generated both from SRTM and Landsat 8 OLI satellite images.

Figure 8. (a–h) Orientation of lineaments extracted from SRTM DEM. (i) Orientation of lineaments – from the merged output of SRTM DEM.

Figure 9. Orientation of lineaments extracted – from Landsat-8 Satellite’s OLI sensor’s FCC.

Figure 10. Orientation of lineaments (both from SRTM DEM and OLI sensor’s FCC).

Figure 11. Orientation of lineaments of varied sizes extracted from SRTM DEM.

Figure 12. Orientation of lineaments of varied sizes extracted from Landsat-8 Satellite’s OLI sensor.

Figure 13. Orientation of lineaments of varied sizes: SRTM DEM + Landsat-8 Satellite’s OLI sensor.