When the project coordinate system is projected and ellipsoidal when the projectĬoordinate system is unprojected / geographic. If “on the fly” CRS transformation is disabled, the measurement metric is planimetric With a geographic (= unprojected) CRS defined for the data and project, area andĭistance measurement will be ellipsoidal. Maths, the measurement ellipsoid has to be set to “None / Planimetric” If you want to calculate the projected / planimetric area or distance using cartesian When geographic and projected coordinate systems are defined for the project. different from most other GIS - ellipsoidal, using the ellipsoid defined inįile ‣ Project properties ‣ General. If “on the fly” CRS transformation is enabled, the default measurement metric is The first three measuring tools behave equally to global project settings: Measuring works within projected coordinate systems (e.g., UTM) and unprojectedĭata. and a vector analysis tool: Vector ‣ Geometry Tools ‣.derived measures in the Identificar objetos espaciales tool,.QGIS provides four means of measuring geometries: In case of negative values, black is displayed. Subtract: This blend mode simply subtracts pixel values of one item from the other.Blending with black produces no change,Īs the difference with all colors is zero. Way around, to always get a positive value. Difference: Difference subtracts the top pixel from the bottom pixel, or the other.To emulate projecting a very intense light onto an image. Hard light: Hard light is also very similar to the overlay mode.This is supposed to emulate shining a soft light onto an image. Soft light: This is very similar to overlay, but instead of using multiply/screen.In the resulting picture, light parts become lighter and dark parts become darker. Overlay: This mode combines the multiply and screen blending modes.Burn: Darker colors in the top item cause the underlying items to darken.īurn can be used to tweak and colorise underlying layers.The corresponding pixels for the bottom item. Multiply: Here, the numbers for each pixel of the top item are multiplied with.Like lighten, the results tend to be jagged and harsh. Darken: This creates a resultant pixel that retains the smallest components of theįoreground and background pixels.This mode is suitable for highlighting features. In case of values above one (in the case of RGB), white is displayed. Addition: This blend mode simply adds pixel values of one item with the other.Esto funciona mejor si los píxeles superiores no son demasiado brillantes de lo contrario el efecto sera demasiado extremo. Así, los píxeles superiores más brillantes provocan la saturación y el brillo de los píxeles subyacentes a aumentar. Este modo es muy útil para la mezcla de la textura de una capa con otra (por ejemplo, puede utilizar un sombreado para texturizar otra capa).Įsquivar: aclarará y saturar píxeles subyacentes en base a la ligereza del punto de imagen superior. Pantalla: píxeles de luz de la fuente se pintan sobre el destino, mientras que los píxeles oscuros no lo son. Tenga en cuenta que los resultados tienden a ser irregulares y rigurosos. Iluminado: Este selecciona el máximo de cada componente del primer y segundo plano de píxeles. Pixel to blend with the pixel beneath it. Normal: This is the standard blend mode, which uses the alpha channel of the top.On layers, on features but also on print composer items: You may previously only know from graphics programs. QGIS offers different options for special rendering effects with these tools that
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