9/2/2023 0 Comments Easy contour drawing hand![]() No more drawing what you “think” you know about flowers. Pick a simple object and ask the kids to really notice each little edge and part. After all, you can’t even see your drawing! Emphasis becomes on really looking at the object and noticing the intricacies of it. The pressure to make your drawing look “just right” is totally gone. I love blind contour drawings for this reason. in fact, if it doesn’t, you probably cheated and looked at your paper! Your kids will giggle until the tears come. A blind contour drawing may look a little weird. This is harder than it sounds because it is so tempting to look at what you’re drawing. Your student looks at and attempts to draw an object’s contours without looking at their paper. My favorite is the blind contour drawing. There are different types of contour line drawing. Encourage kids that although the words may be fancy and the concepts new they’ve actually been doing this all along! (Great job kids!) A blind contour drawing… Kids naturally draw outline type drawings because they are the simplest form of drawing. Lines define every edge of an object with no shading. ![]() Sounds simple, right? Contour line drawing is a big concept that is easily introduced even at a young age and packs a big punch in terms of learning to see what is front of you! This quick blind contour drawing exercise is sure to bring giggles and learning!Ī contour drawing is a line drawing. The site editor may also be contacted with questions or comments about this Open Educational Resource.Contour drawing is essentially drawing the edges or outlines of an object to define it. Please send comments or suggestions on accessibility to the site editor. The College of Earth and Mineral Sciences is committed to making its websites accessible to all users, and welcomes comments or suggestions on access improvements. This courseware module is offered as part of the Repository of Open and Affordable Materials at Penn State.Įxcept where otherwise noted, content on this site is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. Penn State Professional Masters Degree in GIS: Winner of the 2009 Sloan Consortium award for Most Outstanding Online Program Dutton e-Education Institute College of Earth and Mineral Sciences, The Pennsylvania State University. Dutton e-Education Institute and Assistant Program Manager for Online Geospatial Education, and Adrienne Goldsberry, Senior Lecturer, John A. ![]() Dutton e-Education Institute, Beth King, Senior Lecturer, John A. Dutton e-Education Institute Ryan Baxter, Senior Research Assistant, John A. Instructors and contributors: Jim Sloan, Senior Lecturer, John A. Dutton e-Education Institute, and Director of Education, Industry Solutions, Esri. The distinguishing geometric characteristic of a Delaunay triangulation is that a circle surrounding each triangle side does not contain any other vertex.)Īuthor: David DiBiase, Senior Lecturer, John A. One approach is called Delaunay Triangulation which, in one of its constrained forms, is useful for representing terrain surfaces. (There are algorithms for triangulating irregular arrays that produce unique solutions. Similarly, the smaller the contour interval you intend to use, the more spot elevations you need. In general, the density of spot elevations should be greater where terrain elevations vary greatly, and sparser where the terrain varies subtly. Related to this element of subjectivity is the fact that the fidelity of a contour map depends in large part on the distribution of spot elevations on which it is based. As you will see, deciding which spot elevations are "near neighbors" and which are not is subjective in some cases. You may notice that there is more than one correct way to draw the TIN. I omitted breaklines from this example just to make a point. Photogrammetrists refer to spot elevations collected along linear features as breaklines (Maune, 2007). In practice, spot elevations would always be measured at several points along the stream, and along ridges as well. Wonder why I suggest that you not let triangle sides that make up the TIN cross the stream? Well, if you did, the stream would appear to run along the side of a hill, instead of down a valley as it should. With a little imagination and practice, you can visualize the underlying surface from the TIN even without drawing contours. (Spot elevations produced photogrammetrically are called mass points.) A useful characteristic of TINs is that each triangular facet has a single slope degree and direction. The vertices of the triangles are spot elevations that may have been measured in the field by leveling, or in a photogrammetrist's workshop with a stereoplotter, or by other means. A TIN is a vector representation of a continuous surface that consists entirely of triangular facets. The result is a triangulated irregular network (TIN).
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