topic Contour Interval 40m for Topographic Map 100K in Mapping Questions //www.gamepadva.com/t5/mapping-questions/contour-interval-40m-for-topographic-map-100k/m-p/1072457#M8360

Dear All,

I've found that most Topographic Map 100K, its contour interval is 40m. Does anyone know what are the reasons that specific interval is used ?

Thank you in advance !

星期五,2021年6月25日06:57:58格林尼治时间 chhayvanchha 2021-06-25T06:57:58Z 等高线间距40米for Topographic Map 100K //www.gamepadva.com/t5/mapping-questions/contour-interval-40m-for-topographic-map-100k/m-p/1072457#M8360

Dear All,

I've found that most Topographic Map 100K, its contour interval is 40m. Does anyone know what are the reasons that specific interval is used ?

Thank you in advance !

星期五,2021年6月25日06:57:58格林尼治时间 //www.gamepadva.com/t5/mapping-questions/contour-interval-40m-for-topographic-map-100k/m-p/1072457#M8360 chhayvanchha 2021-06-25T06:57:58Z
Re: Contour Interval 40m for Topographic Map 100K //www.gamepadva.com/t5/mapping-questions/contour-interval-40m-for-topographic-map-100k/m-p/1072465#M8361

Link?

Fri, 25 Jun 2021 07:43:31 GMT //www.gamepadva.com/t5/mapping-questions/contour-interval-40m-for-topographic-map-100k/m-p/1072465#M8361 Waffle_House 2021-06-25T07:43:31Z
Re: Contour Interval 40m for Topographic Map 100K //www.gamepadva.com/t5/mapping-questions/contour-interval-40m-for-topographic-map-100k/m-p/1072468#M8362

Sorry I have no idea what you mean, can you say again?

Fri, 25 Jun 2021 08:03:33 GMT //www.gamepadva.com/t5/mapping-questions/contour-interval-40m-for-topographic-map-100k/m-p/1072468#M8362 chhayvanchha 2021-06-25T08:03:33Z
Re: Contour Interval 40m for Topographic Map 100K //www.gamepadva.com/t5/mapping-questions/contour-interval-40m-for-topographic-map-100k/m-p/1072480#M8363

I am not a topography expert, but I believe one of the prime factors for deciding the contour interval is the scale of the map. A smaller scale map will have lower number of contours (to avoid cluttering), thus the contour interval will be higher between two contour lines. A larger scale map can have higher number of contour lines (also depends on the topography/relief of the terrain), thus the contour interval can be smaller between two lines.

e.g. I can see some topographical maps of Cambodia (Scale 1:50,000) where contour interval is 20 meters.

*The organization (usually the National Mapping Agency) that prepares the topographical maps, decides what is the best suited contour interval for a map at a particular scale.

Fri, 25 Jun 2021 08:44:17 GMT //www.gamepadva.com/t5/mapping-questions/contour-interval-40m-for-topographic-map-100k/m-p/1072480#M8363 JayantaPoddar 2021-06-25T08:44:17Z
Re: Contour Interval 40m for Topographic Map 100K //www.gamepadva.com/t5/mapping-questions/contour-interval-40m-for-topographic-map-100k/m-p/1072485#M8364

Thank you so much

Fri, 25 Jun 2021 09:16:59 GMT //www.gamepadva.com/t5/mapping-questions/contour-interval-40m-for-topographic-map-100k/m-p/1072485#M8364 chhayvanchha 2021-06-25T09:16:59Z