Raster calculator setnull SetNull(in_conditional_raster, in_false_raster_or_constant, {where_clause}) Name: Explanation: Data Type: in_conditional_raster. If you wan't the zeros from the first command to be nulls instead: Con("MyRaster" >= Dec 24, 2022 · SetNull函数--设置空函数，多由于对空函数进行值设定。 其中InRaster1中120、140区域由于大于100，满足设置为空条件，因此判别为空值。 IsNull函数--判断空函数，如果输入栅格为空函数，则输出为1，相反则输出 Jan 14, 2015 · You can run Con as a tool or in Raster Calculator. Numerical values and mathematical operators can be added to the expression by clicking the respective buttons in the tool dialog box. 5") Succeeded at Fri Jun 12 23:07:52 2015 (Elapsed Time: 3. May 30, 2015 · 1、 setnull函数 arcpy. Problem with the output is that the extend is based on a smaller raster (one dataset is for the whole world and the second one just for arctic regions which the output is clipped). Dec 1, 2022 · Python利用Arcpy进行栅格运算ArcGIS栅格计算器介绍Arcpy对栅格文件的读取、创建和写入Arcpy进行栅格的数学分析和逻辑运算归纳总结 环境;ArcGIS、Python 2. It is visible in the picture they have at the start of this Help article: Raster Calculator. workspace = outWorkspace ZMAXRas = Raster(ZMAXRas) Jan 16, 2025 · The simplest and fastest way to replace NODATA with something else, is map algebra/raster calculator: It works on float and integer rasters. The Tools list provides a Dec 4, 2020 · 栅格计算器（Raster Calculator） 是一种空间分析函数工具，可以输入地图代数表达式，使用运算符和函数来做数学计算，建立选择查询，或键入地图代数语法。只有熟练的运用并记忆一些常用的公式，才能很好的运用栅格计算器。本文将常见的及一些容易出错的公式予以总结，方便学习工作是参考。 Sep 14, 2024 · 使用珊格计算器通过SetNull 函数（设定空值函数）可以将特定值计算为空值（NoData），SetNull的语法格式为：以上函数的意思即设定所有的0值为无数据NoData。ArcGIS中的栅格计算通常借助功能强大的栅格计算器（raster calculator）来实现。键入 May 17, 2012 · Dot notation does not work in the 10. IS NOT NULL), then the raster cell gets the original input raster Oct 15, 2024 · The Raster Calculator tool allows you to create and run a map algebra expression that will output a raster. I cant'use reclassify because my grid is a continuous raster! May 16, 2011 · I have a DEM that has missing points due to ponding water, how do I go into raster calculator and give the no data points a value, so I can fill them in with ArcHydro? Thanks Mark Campbell Jun 16, 2015 · SetNull("x","x","VALUE>5") I would highly recommend getting students away from the SQL parameter and use this instead in Raster Calculator SetNull("x" > 5, "x") Jan 17, 2025 · I don't think it can be done with the raster calculator, but according to this answer, you can use GDAL's translate function (Raster > Conversion > Translate) to convert 0's to NoData (check the "No data" box and let the corresponding value to Aug 28, 2024 · Con函数1、Con函数是用于栅格计算中条件判断的工具，根据所需条件进行应用启动ArcGIS在ArcTool box中，依次点击Spatial Analyst tools → Map Algebra (地图代数）→ Raster Calculator（栅格计算）con(条件，为真的取值，为假的取值)2、根据所需条件进行 Jan 17, 2025 · Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site Oct 10, 2024 · The Raster Calculator tool allows you to create and run a map algebra expression that will output a raster. Mar 27, 2013 · Will the Raster Calculator ignore the null value cells in the average or will it count that cell in the denominator value for the average function? I see that Cell Statistics has an option to ignore null value cells, which reads like it would be what I want but their graphic example seems to suggest that what it does is ignore the entire cell Apr 8, 2019 · （4）然后就可以直接用spatial analysis->raster calculate进行计算了。 补充：con函数可以把特定的栅格值设置为某一个值。 setnull函数可将特定的栅格值赋值为空值。 setnull([raster==1],[raster]),将raster中值为1的数据赋为空，其他保留原值 Aug 3, 2022 · 使用珊格计算器通过SetNull 函数（设定空值函数）可以将特定值计算为空值（NoData），SetNull的语法格式为：以上函数的意思即设定所有的0值为无数据NoData。ArcGIS中的栅格计算通常借助功能强大的栅格计算器（raster calculator）来实现。 Jan 16, 2025 · Now I want to extract only these areas using the Raster Calculator with the expression "Raster@1" = 190. If you're going to ask questions here, post exactly what you did, don't approximate. It’s a very flexible and versatile algorithm that can be used for many different calculations, and one that will soon become an important part of your May 12, 2010 · Solved: Hi there, I was wondering if someone could help me convert all -1 to null in my aspect raster using raster calculator. workspace = "C:/arcpyExamples/data" # Set local variables Jan 16, 2025 · ArcGIS Raster Calculator Con() set 0 values to null. There is Con and IsNull however. by Zheng_KiYip. The condition is specified by a logical math raster function, which must be the Dec 24, 2022 · CON(ISNULL("raster"), 100, "raster") ``` 此表达式的含义是如果 `"raster"` 中存在空值，则这些位置被赋值为 100；否则保留原始值[^3]。 #### 使用 `SetNull` 函数排除不需要的数据 对于某些应用场景下，可能更 Apr 26, 2018 · （4）然后就可以直接用spatial analysis->raster calculate进行计算了。 补充：con函数可以把特定的栅格值设置为某一个值。 setnull函数可将特定的栅格值赋值为空值。 setnull([raster==1],[raster]),将raster中值为1的数据赋为空，其他保留原值 SetNull(Raster(r"random"),Raster(r"random"),"VALUE>0. surmization The raster calculator whips in the Raster around the inputs ( I should have been 3 days ago · The raster calculator is one of the most powerful algorithms that you will find. The first is a conditional raster, where cells not equal to zero (equivalent to boolean TRUE) should be set null. SETNULL([aspect] == -1, [aspect]) View solution in original post. Feb 13, 2012 · To change NoData value to 0, you can simply use the raster calculator with following statement: Con(IsNull(raster), 0, raster). [ATTACH=CONFIG]11938[/ATTACH] Hi! I've a similar problem. 1. The tool returns NoData for an output cell if the evaluation on an input conditional raster is true; otherwise, it returns the value identified by the false input, which can be a raster or a constant value. Available with Image Analyst license. Improve this answer. 8. env. 3 (the expression "myraster@1" > 0 returns 0 or 1 for non-nodata input, for nodata input it returns nodata). All Communities. The Sep 18, 2023 · 栅格计算器中的setnull功能是指将栅格数据中的特定数值（通常是无效的或者不感兴趣的数据 - 在ArcGIS软件中，可以通过重分类工具（Reclassify）和栅格计算器（Raster Calculator）进行聚合和聚类分析，例如利用Select()、Setnull()和Con()等函数进行 Jan 17, 2025 · I intended to use raster calculator to subtract raster B from raster A which would leave the areas to be removed with value 0, and I could then reproject this setting 0 to null - however this doesnt work as outside the masked area 'A - null = null' and I end up with a calculated raster of 0 in only the area I want to remove, and null everywhere Jan 8, 2015 · On the right side of the Raster Calculator will be a group of tools. I want to replace in a grid map, all the values over a threshold with a new value. Oct 4, 2024 · Learn more about setting cell values to NoData with Set Null. Then attach the set null tool to the output of your iterator. Nov 13, 2024 · # Import system modules import arcpy from arcpy. 6栅格计算器（Raster Calculator ）用法详解 「 刘一哥与GIS的故事」 12-04 2万+ 参考阅读：【ArcGIS风暴 Dec 9, 2024 · 栅格计算器（Raster Calculator） 是一种空间分析函数工具，可以输入地图代数表达式，使用运算符和函数来做数学计算，建立选择查询，或键入地图代数语法。只有熟练的运用并记忆一些常用的公式，才能很好的运用栅格计算器。本文将常见的及一些容易出错的公式予以总结，方便学习工作是参考。 Jul 17, 2022 · Menghapus Nilai Sel Raster dengan Raster Calculator Cara kedua ini adalah yang paling mudah karena langkah-langkah pada point 1 s/d 11 diatas akan dibuatkan dalam expressi map algebra, cukup dengan satu baris saja Nov 14, 2024 · 栅格计算器 工具用于创建和运行将输出栅格的地图代数表达式。 使用 栅格 列表选择要用于表达式中的数据集和变量。 工具 列表提供了一组常用的条件分析工具和数学工具，可将其添加到表达式中。 可直接将数值（和数学 May 1, 2015 · I am able to perform Calculate the Statistics for the raster and this time it actually changes things (I couldn't use Classification as a symbology method since the histogram wasn't calculating before, but now that is an allowed symbology option). Reply. You can find SetNull under "Conditional". Frequent Contributor 05-12-2010 03:14 PM. When building expressions in the Raster Calculator tool, clicking and double-clicking the various layers, variables, buttons, and tool names on the dialog box will help you to avoid syntax errors that may otherwise be made while typing. Cellsize Type: Choose which cell size to use in the output raster. This works fine, the resulting Raster contains value 1 for all cells which where 190 before (as it is supposed to) but no data values (high negative values) for all other cells, which I need to be zero instead. ia import * # Check out the ArcGIS Image Analyst extension license arcpy. Note IsNull is a function and you pass it something to test for null values. The second is the false raster, representing the desired output cell values where the conditional raster is equal to zero (equivalent to boolean FALSE). tif") 设置非空区域 Feb 4, 2020 · You should be able to nest you raster calculator commands. I got stuck adding together multiple raster layers with null values in ArcMap. 0) try this: Con("depth_layer" < 0, 0,"depth_layer") If you want to just see which values are below 0 use simply: "depth_layer" < 0 1 day ago · ### 如何在 ArcGIS 中提取像元值为 255 的栅格数据 可以使用 **栅格计算器 (Raster Calculator)** 和 **SetNull 函数** 来实现这一目标。这种方法允许基于特定条件筛选像素，从而精确提取满足条件的像元值[^1]。 Jan 29, 2022 · You can use ModelBuilder in ArcGIS to accomplish this. Else if the raster cells evaluates FALSE (i. It is a good idea to specify type of output raster explicitly, using built-in functions Int or Float. Jun 15, 2015 · All Communities Developers User Groups Industries Services Community Resources Global Events Learning Networks ArcGIS Topics Products View All Communities Feb 2, 2016 · 单波段数据处理起来常常相对容易些，最常用的工具就是 栅格计算器/Raster Calculator 了。Raster Calculator 可以通过输入的Python语法的表达式，对当前数据框内的栅格图层进运算。它是个非常实用的栅格数据处理工具，如果你想 Dive In ，点 这里了解 Raster Jan 11, 2023 · 栅格计算器（Raster Calculator） 是一种空间分析函数工具，可以输入地图代数表达式，使用运算符和函数来做数学计算，建立选择查询，或键入地图代数语法。只有熟练的运用并记忆一些常用的公式，才能很好的运用栅格计算器。本文将常见的及一些容易出错的公式予以总结，方便学习工作是参考。 Nov 14, 2024 · SetNull (a,b) 参数 参数名称 描述 栅格变量 用户定义的变量名和输入栅格。表达式 构建代数表达式以对输入栅格执行空间分析。像元大小类型 选择输出栅格中使用的像元大小。 如果所有输入像元大小均相同，则所有选项都会产生相同的结果 Oct 15, 2024 · When NoData is added to a file-based raster that already has a full-bit range (meaning that all the values in the bit range, for example, 0 to 255, are all represented by at least one cell), it will be promoted to the next higher bit depth. The only value that is changing is the stretch value. usually if the data is loaded into ArcMap, you can choose the raster layer from the list. The Tools list provides a selection of commonly used conditional and mathematical tools, allowing you to add them to the expression. mask=IsNull ("SmallRegion. Use the Rasters list to choose the datasets and variables to use in the expression. Hot Network Questions Oct 4, 2024 · Raster Variables: The user-defined variable name and the input raster. I tried setnull within raster calculator and it just changes the values of the polygons. Expression: Build an algebraic expression to perform spatial analysis on the input raster. Using ArcView10 Many Nov 19, 2024 · 如果 输入条件栅格 （Python 中的 in_conditional_raster ）是单波段栅格，并且 输入条件为假时所取的栅格数据或常量值 （Python 中的 in_false_raster_or_constant ）栅格是常量，输出将是单波段栅格。如果两个输入都是多波段栅格，则输出将是多波段栅格。 Raster calculator failed when using setnull function. A useful tool is SAGA Reclassify values (QGIS Processing Toolbox | SAGA | Raster tools | Reclassify values). What I need is a raster with 1 for protected area and 0 for no protected area so I can run a number of calculations Jun 28, 2017 · The Raster Calculator can do a lot, but the documentation is pretty scarce. Something like this: SetNull(Lookup("Raster","COUNT") <= 250, "Raster" ) Using raster attribute other than 'value' in map algebra Lookup function in v10. Jan 16, 2014 · I wonder if anybody knows of the right conditional statement to be used in Raster Calculator to set to "Null" (NoData) the raster cells of Raster 1 that coincide (overlap) with cells in Raster 2. Lager@1 has some information I need as the first option, this has no-data -9999 (reading in the properties). Share. 25 seconds) Conclusion. CheckOutExtension("Spatial") outSetNull = SetNull(inputRaster,inputRaster,"VALUE < 0") outSetNull. I need this expression to work. Jump to solution. 7 ArcGIS栅格计算器介绍 ArcGIS中的工具箱有栅格计算器工具，它提供的时地图代数功能，可以实现很多复杂的栅格代数运算处理，但栅格计算器工具专门 Sep 20, 2021 · The Raster Calculator tool allows you to create and execute a Map Algebra expression that will output a raster. It returns NoData if a conditional evaluation is true, and returns the value specified by another Sep 25, 2012 · If you want to turn values below 0 into NoData and leave the rest untouched try this expression in Raster Calculator: SetNull("depth_layer" < 0, "depth_layer") If you want to Jan 19, 2024 · setnull函数可将特定的栅格值赋值为空值。 setnull([raster==1],[raster]),将raster中值为1的数据赋为空，其他保留原值 mask=IsNull("SmallRegion. The syntax in raster calculator is something like this: SetNull (in_conditional_raster, in_false_raster_or_constant, {where Nov 6, 2021 · There are no such functions as con or isnull, your expression should never have even been able to run. . Your expression should look like Con(IsNull(DEM), Cloud, Aug 10, 2016 · All, Thanks for your help and especially Neil Ayres as his solution is basically a whole lot easier (see below)! With a second set of eyes looking over my shoulder we cracked this frustrating problem. save(outputRaster)注意：一定要检查许可否则会报错；另外，其中的whereclaus_arcpy setnull arcPython细节汇总-setll函数和地图计算 Aug 6, 2019 · The SetNull tool requires two raster layers in the simplest usage. Jun 13, 2023 · SetNull函数是用于将某些像元的值设置为空值（NoData）的函数。它的语法如下： ``` SetNull (in_conditional_raster 使用ArcGIS 10 Raster Calculator 进行背景数据去除 1. When you run the model, it should iterate/loop through each raster and apply your set Null to each raster. The following QGIS Raster Calculator expression should be sufficient (raster layer named "myraster"), since the QGIS Raster Calculator sets all pixels that do not satisfy the Sep 25, 2012 · If you want to turn values below 0 into NoData and leave the rest untouched try this expression in Raster Calculator: SetNull("depth_layer" < 0, "depth_layer") If you want to change values below 0 into some value (eg. This command does not produce values where Lager@1 is no-data May 3, 2018 · In a phase when iterating raster datasets and using raster calculation to use setnull function to exclude some criteria in a final raster. IS NULL), the cell gets a value of 0. sa import * arcpy. Create a new model then add an 'iterate raster' iterator. See images below. The tool returns NoData for an output cell if the evaluation on an input conditional Apr 26, 2018 · （4）然后就可以直接用spatial analysis->raster calculate进行计算了。 补充：con函数可以把特定的栅格值设置为某一个值。 setnull函数可将特定的栅格值赋值为空值。 Sep 20, 2021 · Set Null sets identified cell locations to NoData based on a specified criteria. Keep this ticked-on, and set new value for no data values to 0. Lager@2 has the information I want to complete what is no data in Lager@1. Use the Layers and variables list to select the datasets and variables to use in the expression. It returns NoData if a conditional evaluation is true, and returns the value specified by another Jan 19, 2024 · setnull 函数 可将特定的栅格值赋值为空值。 setnull ( [raster==1], [raster]),将raster中值为1的数据赋为空，其他保留原值. Notes. (Raster Calculator is really more for interactive use or ModelBuilder. Mark as New; Bookmark; Subscribe; Mute; Subscribe to RSS Feed; Permalink; Print; Report Inappropriate Content; Hi Everyone, Dec 28, 2011 · in_conditional_raster = your input raster in_true_raster_or_constant = 0 in_false_raster_or_constant = your input raster where_clause = VALUE IS NULL If the raster cell evaluates as TRUE (i. It works in ArcMap's raster calculator but since SetNull moved to its own tool in Pro, I cant figure it out: SetNull((5 – “example. Since the expression entered in the Raster Calculator tool Dec 24, 2022 · SetNull函数--设置空函数，多由于对空函数进行值设定。SetNull函数 SetNull函数结果 其中InRaster1中120、140区域由于大于100，满足设置为空条件，因此判别为空值。IsNull函数--判断空函数，如果输入栅格为空函数，则输出为1，相反则输出为0。IsNull函数 Jul 12, 2019 · Raster Calculator SetNull("Band1" == 10, "Band1") Band 2 would run, but the "NoData" pixels would stay at their same value (would not change). 0 (I think this is default value). Follow Apr 24, 2019 · （4）然后就可以直接用spatial analysis->raster calculate进行计算了。补充：con函数可以把特定的栅格值设置为某一个值。 setnull 函数可将特定的栅格值赋值为空值。 setnull([raster==1],[raster]),将raster中值为1的数据赋为空，其他保留原值 mask=IsNull Feb 23, 2022 · Spatial Analyst tools → Map Algebra → Raster Calculator 栅格计算器的运算对象是栅格，可以把他看作一个“数字”对象。 二、ArcGIS栅格计算器中SetNull（）函数的使用 （一）SetNull（）函数的用法 SetNull（）函数会根据指定条件将所识别的像元 Sep 13, 2017 · When I do this I do not have null values (0) for the rest of the cells. 1 Kudo 1 Reply by JeffreyEvans. If all the input cell sizes are the same, all the options will yield the same results. 0? Thank you for the answer Timothy. The Set Null tool sets identified cell locations to NoData based on a specified criterion. You will need to use the Lookup function. 2. 0 Raster Calculator. This also seems far more direct than using SetNull in the raster calculator. Sep 20, 2021 · Learn more about setting cell values to NoData with Set Null. When Run this tool, the NoData cells become 0. If the evaluation is false, the output raster will be defined by the input false raster or constant value. It can be found, alternatively, in the processing toolbox (Menu Mar 27, 2023 · The QGIS Raster Calculator is a powerful tool within the QGIS software that allows you to perform mathematical operations on raster layers. Probably like Dan Patterson I'm used to using the geo-processing tools or scripting it and I was looking for a way to include the criteria part of the set null tool in the Apr 11, 2016 · After successfully performing the operation of interest using the Raster Calculator tool with the following conditional statement SetNull("flowAccumulationRaster"<threshold,1), I have been trying to implement this in a Python script. CheckOutExtension("ImageAnalyst") # Set the analysis environments arcpy. I want to maintain all the rest of. 06-12-2015 06:03 PM. I looked through polygon to raster and can't find a set null value. There are two ways to assign the cell value in a raster dataset to be NoData—using the Set Null . e. workspace = "C:/arcpyExamples/data" # Set local variables in Oct 26, 2021 · 空值是数据的一种特殊状态，当某个字段没有被赋值或者在数据获取、处理过程中数据缺失时就会出现空值。字符串型的【空格】虽然看起来字段内没有内容，但在ArcGIS中空格也是一种有意义的内容。鉴于【空值】的诸多隐患，我个人习惯于尽量避免空值的出现，特别是一些需要后续处理的字段。 Oct 4, 2024 · Set Null sets identified cell locations to NoData based on a specified criteria. My first answer is not correct for QGIS 2. sa import * # Check out the ArcGIS Spatial Analyst extension license arcpy. Con can also be used like SetNull: If no input false raster or constant is specified, NoData will be assigned to those cells Oct 15, 2024 · The Set Null tool sets identified cell locations to NoData based on a specified criterion. Conditional formatting QGIS Legend. 1. Dec 18, 2020 · Hi all, I am trying to finish a final project for a class and I cannot for the life of me figure out how to get the SetNull syntax to work properly. If the evaluation is true, the pixel location on the output raster will be assigned NoData. ) Try this and see if it works better: from arcpy. You can use the raster calculator to create new raster layers from existing ones, combine multiple raster layers, or perform various types of calculations based on the pixel values of the raster layers. Aug 24, 2022 · 使用珊格计算器通过SetNull 函数（设定空值函数）可以将特定值计算为空值（NoData），SetNull的语法格式为：以上函数的意思即设定所有的0值为无数据NoData Oct 15, 2024 · Set Null sets identified cell locations to NoData based on a specified criteria. Please see images: Raster 1 in red Raster 2 in blue The areas in red that coincide with the areas in blue should become "Null". 0 Map Algebra: implementing dot notation in v10. Feb 13, 2018 · Using Raster Calculator you can use SetNull tool as follows: SetNull("RasterName"==0,"RasterName") You need to change RasterName with the name of the raster data. Subscribe. If the evaluation is false, the output raster will be defined by the False Raster or constant value. Illustration OutRas = SetNull(InRas1, InRas2, "Value = 4") Usage. If the evaluation of the where clause is true, the cell location on the output raster will be assigned NoData. tif”) < 0, 5 – “example Jan 29, 2025 · I am trying to patch two rasters with the raster calculator but I am not finding a way to work with no-data values. Oct 26, 2021 · As noted in the commnents below: The QGIS native raster calculator (the one under discussion here) can be found in Menu Raster > Raster Calculator. We use only replace no data values option. `SetNull(expression, replacement)`：这是ArcGIS中的一个内建函数，它的作用 Oct 15, 2024 · Available with Spatial Analyst license. CheckOutExtension("Spatial") # Set the analysis environments arcpy. It returns NoData if a conditional evaluation is true, and returns the value specified by another raster if it is false. 14. arcpy: RUSLE S value - Set null in raster is not setting values to null. New Contributor II 06-12-2015 06:03 PM. If one of the rasters has a cell with a null value, then when that cell is added to values from other cells it still equals null. 8232. Make sure replace other values option is off. Numerical values (and mathematical Oct 15, 2024 · Available with Spatial Analyst license. I have determined through lots of searching that the Raster Calculator approach doesn't translate directly in Nov 19, 2024 · 栅格计算器 工具用于创建和运行将输出栅格的地图代数表达式。 使用 栅格 列表选择要用于表达式中的数据集和变量。 工具 列表提供了一组常用的条件分析工具和数学工具，可将其添加到表达式中。 可直接将数值（和数学运算符）添加到表达式中。 可在引号 ("") 中输入数据的完整路径或指定的 Aug 28, 2024 · 使用珊格计算器通过SetNull 函数（设定空值函数）可以将特定值计算为空值（NoData），SetNull的语法格式为：以上函数的意思即设定所有的0值为无数据NoData。ArcGIS中的栅格计算通常借助功能强大的栅格计算器（raster calculator）来实现。键入 Apr 5, 2024 · Many thanks to Dominik. The expression means change the raster data with zero value to Null and keep other values Apr 16, 2022 · SetNull() 功能将指定变量的值设置为NULL。这里的变量可以是除数组、结构、自动实例化对象之外的任何数据类型。 中文名 【ArcGIS风暴】ArcGIS10. tif") 设置非空区域为0，空值区域为1。 SetNull("mask"==0,1) 设置掩膜层中值为0的为nodata，而其余 的 May 26, 2017 · (1) Change Null to 0. How to calculate average raster index values using window around specified points in ArcGIS Pro. ArcGIS Help 10. Community. The input Mar 8, 2013 · In it I need to use SetNull function several times to extracting the required values from the raster dataset. fyjj rqct isgals njcyl vxeg nayyssu xfxwtly wfv ndno kuqeap ctky ifmeo ovkzbcya azlp dzbkb