What are the three types of annotations for feature symbols, what are the types of feature symbols,

There are three types of feature symbols: proportional symbols, non-proportional symbols and semi-proportional symbols.

1. Scale-based symbols refer to symbols that can maintain the plane contour of objects, which are called outline symbols or true symbols. The objects represented by proportional symbols occupy a considerable area on the ground, and the symbols representing forests, oceans, lakes, etc., on the map, are proportional symbols.

2. Non-scale symbols refer to map symbols that are not represented according to the map scale. Generally, it is an important feature symbol that cannot be displayed after being reduced according to the map scale, such as independent feature symbols such as triangular points, wells, springs, and towers on large-scale maps.

3. Semi-scale symbols refer to linear symbols whose length is expressed according to the map scale, but the width is not represented by the map scale.

Classification and representation of feature symbols.

1. Classification according to the graphic characteristics of the figure symbols.

orthographic symbols; side-view symbols; Symbols.

2. Classification of the proportional relationship between symbols and features.

proportional symbols; semi-proportional symbols; Non-proportional symbols.

3. Classification according to the positioning of symbols.

Positioning Symbols; Illustrative symbols.

Features: Contour closure; more high and less low; Dense and steep and sparse; Resembling the ground; No pay, no weight; Orthogonal water separation, water collection line, contour line.

There are three types of annotations for feature symbols: text annotation, numerical annotation and symbol annotation.

1.Textual annotation: used for administrative names, unit names, village names, and names of roads, railways, rivers, etc.

2.Numerical annotation: It is used for the elevation on the topographic map, the velocity and depth of the river, the number of floors of the house, the length and width of the bridge, and the load capacity.

3.Symbolic annotation: Use specific symbols to indicate the vegetation species on the ground, such as grassland, arable land, woodland categories, etc.

These are the three types of annotation for figure symbols, I hope it will help you.

Answer: Feature symbols can be divided into proportional symbols, non-proportional symbols, and semi-proportional symbols according to the proportion and degree of abstraction.

1) Scale symbols: those that can be reduced according to the scale of the survey are called scale symbols. Such as houses, lakes, forests, farmland, etc.

2) Non-proportional symbols: Some features such as control points, street lights, electric poles, etc., their size is relatively small, can not be reduced according to the scale of the map, then do not consider their actual size and use the specified symbols to express, this symbol is called non-proportional symbols. Non-proportional symbols can only represent the location of the figure on the map, not the shape and size of the figure.

3) Semi-proportional symbols: Some features that extend in a linear form, such as fences, pipelines, etc., can be drawn in length according to the mapping scale, and the width can not be drawn according to the mapping scale, and the symbols reflecting this kind of features are called half-proportional symbols. It can only represent the length of the figure, not the width of the figure.

Note. The various words and numbers that play an illustrative role on the map are collectively referred to as annotations. Annotations are often used in conjunction with symbols to indicate the name, location, range, height, grade, priority, and so on of the features represented on the map.

Annotation can be divided into name annotation, description annotation, and number annotation. Name annotation refers to the annotation of various terrain and ground dry branches with proper names by fonts of different specifications and colors, such as the names of oceans, lakes, rivers, rivers, and mountains. Explanatory annotation refers to various annotations that use words to express the quality and characteristics of topography and features, such as annotations representing forest tree species and indicating the bottom quality of water wells.

Digital annotation refers to the annotation of numbers and fractions of different specifications and colors to express the quantitative concept of terrain and features, such as elevation, water depth, latitude and longitude, etc. For the purpose of being clear, correct, and easy to read, the font, specification, and purpose of annotations must be uniformly specified.

I suggest you search for map symbols. Here's a ** for you.

Topographic symbols, features on the ground, are represented on the map in accordance with the symbols and annotations specified in the Topographic Map Form, and these symbols are called feature symbols. Definition The features on the ground are represented on the map in accordance with the symbols and annotations specified in the "Topographic Map Form", and these symbols are called the Character Symbols. Composition Figure symbols are made up of shapes and colors.

1) the classification of feature symbols feature symbols can be divided into three categories: the first type is the symbol that is represented by scale, this kind of symbol is drawn according to the scale according to the actual outline of the feature on a scale, and is mainly used to represent a larger area of features, such as towns, forests, rivers, etc.; The second type of symbols according to the scale is mainly used to represent some slender features, and the length of this kind of symbol is drawn according to the scale in combination with the actual drawing, but the width is not abbreviated according to the scale, such as roads, ditches, wires, etc.; The third category is the symbols that are not represented by scale, which cannot be drawn according to the scale because the area of the feature is too small, and can only be represented by the prescribed symbols, such as prominent trees, pavilions, monuments, etc. Commonly used non-scale-based figure symbols and their anchor points.

2) The color of the features The maps published in China are all four-colored. The specific regulations are as follows: Black:

Artificial objects - residential areas, independent features, pipelines, fences, roads, boundaries and their names and quantities annotated and other green: vegetation elements - forests, orchards, etc.; Vegetation symbols and annotations of maps published after 1978 are brown: the general dyeing of forests, orchards, etc., which are elements of the land's appearance; Vegetation symbols and annotations of the 1978 post-publication map in blue

Water system elements - river shoreline, single-line river and its annotation and general dyeing, snow-capped mountain landform, etc.

1. Proportional symbol: It is a similar figure that directly indents the physical object on the drawing according to the scale of the figure, so it is also called the outline symbol.

2. Non-proportional symbols: The actual area of the ground is very small, so that it cannot be abbreviated on the drawings of the manuscript with a mapping scale, and some specific symbols are often used to mark its position.

3. Non-proportional symbols: The actual area of the ground is very small, so that it cannot be abbreviated on the drawings with a mapping scale, and some specific symbols are often used to mark its position.

4. Linear symbols: the length is proportional, and the width can not be proportional to the symbol, a certain feature into a strip or narrow shape, such as railways, highways, etc., its length can be drawn according to the scale of the map, but the width is not according to the scale.