I downloaded Landsat 8 imagery from Earth Explorer for a particular area.  I tried to get it with no cloud cover, but it did not show any results.  The least amount of cloud cover that I could get was 40%.  Is there a way that I can remove the cloud cover in ArcGIS for Desktop 10.5?  I have seen script on how to do it but I cannot figure out how to do it in ArcMap.  Does anyone know how you can remove cloud cover from Landsat imagery in ArcMap?
I have a land cover classification derived from Landsat TM imagery - I created this classification using ENVI. I would like to edit individual and groups of cells in some areas of the classification in order to improve the accuracy of the output by comparing it with aerial imagery.  Is there a way, using ArcGIS Desktop, to manually edit large groups of cells by selecting them and assigning them to a new or existing class?   I am aware of merging methods based on class statistics, but the area I'm classifying has a high amount of spectral confusion due to thin cloud cover - it seems like a manual edit is the only way to go.
Does the  core rulebook contain any information that is not included already on  that would make it worth it to buy the PDF version of the manual? Or does it only have extra descriptive text? Updating a field programmatically, hook_node_update Currently trying to update a field every time a node is created or updated. However the value is not being populated within the node, do I have access to the node object with this particular hook? What could I be missing?    function vbtoken_node_update($node) {         entity_get_controller('node')-&gt;resetCache(array($node-&gt;nid));         $types = node_type_get_types(); //What are the current Node Content Types?       $yes = ($types['volunteer_project']-&gt;type);        if($node-&gt;type === $yes){           $hash = md5($node-&gt;title . $node-&gt;nid . $node-&gt;nid);         $hashed = substr($hash, 0, 6);         $node = node_load($node-&gt;nid);         $node-&gt;tcode[$node-&gt;language][0]['value'] = $hashed;         node_save($node);          watchdog('vbtoken', 'Added a new Token code to %nid', array('%nid' =&gt; $node-&gt;nid));          }         else          {           dpm('not working dude');         }      } Logarithmic y-axis and restrict y to domain fails I'm trying to plot data with a logarithmic y-axis and restricting the y-data to a specified domain, but compilation fails for a reason I don't understand. This is the code:  \documentclass{standalone} \usepackage{pgfplots} \begin{document}% \begin{tikzpicture} \begin{axis}[ymode=log, restrict y to domain=1:6] \addplot coordinates {(0, 1.1e1) (1, 1.7e3) (2, 0.0e0) (2, 3.4e7) (4, 8.1e5)}; \end{axis} \end{tikzpicture} \end{document}   Running it results in an error message:  ! Missing number, treated as zero. &lt;to be read again&gt;                     i l.6 ..., 1.7e3) (2, 0.0e0) (2, 3.4e7) (4, 8.1e5)};   According to the pgfplots manual for version 1.5.1 (29 December 2011), page 272 (about restrict x/y/z to domain), For logarithmic axes, min and max are logs of the respective values. If I disable either the logarithmic y-axis or the domain-restriction, the code runs successfully and output is as expected (but not as desired).  Software versions:   pdfTeX, Version 3.1415926-2.3-1.40.12 (TeX Live 2011) (format=pdflatex 2012.5.30) pgfplots 2011/12/29 v1.5.1 (git show 1.5.1-4-g53e640f )  tikz 2010/10/13 v2.10 (rcs-revision 1.76).   What's going on? What am I doing wrong? Or is this a bug? How can momentum but not energy be conserved in an inelastic collision? In inelastic collisions, kinetic energy changes, so the velocities of the objects also change.  So how is momentum conserved in inelastic collisions? How do you write something that was discussed in the past, while the issue still exists in the present?        The discussion resulted in the committee members highlighting crucial areas that need to be addressed.   The discussion resulted in the committee members highlighting crucial areas that needed to be addressed.      ......................     1'. The discussion resulted in the committee members highlighting crucial areas that need to be addressed if one is to achieve the desired outcome.      2'. The discussion resulted in the committee members highlighting   crucial areas that needed to be addressed if one were to   achieve the desired outcome. LaTeXiT is cropping the pdf I am using LaTeXiT (pierre chachatelier, www.chachatelier.fr) - latex equation editor for Powerpoint for mac.  It's producing pdf that appear to be "cropped" on top (see attached) - I've tried already with changing the "margins" option (Preferences>General) but unsuccessfully - don't think that's the problem.   Any hint?   Thanks Wrapped hexagon topology When a square is wrapped at the edges, obtains a torus. Is it possible to do the same for a hexagon?  What is the shape/topology of wrapping a hexagon?     Note: I was just reading this  and came up with this question. I'm a physicist. Evaluating the indefinite integral $ \int \sqrt{\tan x} ~ \mathrm{d}{x}. $ I have been having extreme difficulties with this integral. I would appreciate any and all help. $$ \int \sqrt{\tan x} ~ \mathrm{d}{x}. $$ Parental controls with different settings for different users Does anyone know of a good way to set up some sort of parental controls so that one user account is subject to them, but not another?  A couple of friends of mine use Ubuntu and have kids (7 to 10 years old) who use the family computer. They'd like to have some blocking of adult sites. They're not going to supervise all the time, which I know might be ideal, but there we go. And they're not particularly technical, so they don't want to have to run scripts to turn the parental controls on and off regularly, but they can cope with having different accounts for different people. I haven't found a great way of doing this. I am pretty technical, so I'm happy to spend some time at the command line to set it up, but then it needs to just work.  Please don't just link to DansGuardian. If your answer doesn't address the different user account aspect, I will vote it down. If you want to talk about general parental controls that apply to all users then please start a new question - I'm sure that plenty of people would be interested in it, and I'll link to it from this question. elementary row operation change the eigenvalue of a matrix I know that elementary row operations may change the eigenvalues of a matrix, but if these operations don't change the determinant, why should change the eigenvalues??  Thanks Analogue of closed graph theorem This is the analogue of closed graph theorem for compact space          Suppose that $X$ and $K$ are metric spaces, that $K$ is compact, and that the graph of $f: X \rightarrow K$ is a closed subset of $X \times K$. Prove that $f$ is continuous.      Because metric space is first countable, all we need is to prove that if $x = \lim_{n \rightarrow \infty} x_{n}$, then $f(x) = \lim_{n \rightarrow \infty} f(x_{n})$. Suppose $x = \lim_{n \rightarrow \infty} x_{n}$, then because $K$ is compact, sequence $\{f(x_{n})\}$ has a subsequence $\{f(x_{n_{i}})\}$ converge. Because the graph of $f$ is closed, we must have $\lim_{n \rightarrow \infty}\{f(x_{n_{i}})\} = f(x)$. All we need to prove now is $\{f(x_{n})\}$ converge to $f(x)$, but I can't prove that. Can any one help me. I really appreciate. Thanks Is kinetic energy a relative quantity? Will it make inconsistent equations when applying it to the conservation of energy equations? If the velocity is a relative quantity, will it make inconsistent equations when applying it to the conservation of energy equations?  For example:  In the train moving at $V$ relative to ground, there is an object moving at $v$ relative to the frame in the same direction the frame moves. Observer on the ground calculates the object kinetic energy as $\frac{1}{2}m(v+V)^2$. However, another observer on the frame calculates the energy as $\frac{1}{2}mv^2$. When each of these equations is plugged into the conservation of energy, they will result in 2 distinct results (I think). Circular duplicate link allowed How to save a copy of a multiplayer world in the new 0.7+ menus? How do you save a joined game after the 0.7.1 update? The menus have all changed since 0.6.x and I can't find the option to save a copy of a joined world anymore. (My friend has got a diamond house on survival and I want to save it but it doesn't let me!) Computing $\lim_{n\rightarrow \infty} \frac{1+\sqrt{2}+\sqrt[3]{3}+\cdots+\sqrt[n]{n}}{n}$. I have a problem with the calculation of the following limit. \begin{equation} \lim_{n\rightarrow \infty} \frac{1+\sqrt{2}+\sqrt[3]{3}+\cdots+\sqrt[n]{n}}{n} \end{equation} I do not know where to start! Thank you very much GOTO still considered harmful? What are the rules of parallelism? I've been reading a lot about it since yesterday and all I encounter is "They must have the same grammatical form"? What does this exactly mean?  I know how to make parallel sentences with gerunds. The things get trickier when it comes to using modifiers.  For example:     I love using the phone that you bought me and the computer.   On the left side of the conjunction there is a noun phrase that consists of an article + noun + another modifier and on the right side there is an article + noun.  They are both noun phrases but the first one has additional modifier. Is that still considered a parallel sentence?  Another example:     I like to swim and to feel good.   Here on the right side of the conjunction there is an infinitive and on the left side there is an infinitive + complement? Is that parallel? "See somebody do" and "see somebody doing" Logic Behind StackOverflow Question IDs Is $R^2$ useful or dangerous? I was skimming through  by Cosma Shalizi (in particular, section 2.1.1 of the ), and was reminded that you can get very low $R^2$ even when you have a completely linear model.  To paraphrase Shalizi's example: suppose you have a model $Y = aX + \epsilon$, where $a$ is known. Then $\newcommand{\Var}{\mathrm{Var}}\Var[Y] = a^2 \Var[x] + \Var[\epsilon]$ and the amount of explained variance is $a^2 \Var[X]$, so $R^2 = \frac{a^2 \Var[x]}{a^2 \Var[X] + \Var[\epsilon]}$. This goes to 0 as $\Var[X] \rightarrow 0$ and to 1 as $\Var[X] \rightarrow \infty$.  Conversely, you can get high $R^2$ even when your model is noticeably non-linear. (Anyone have a good example offhand?)  So when is $R^2$ a useful statistic, and when should it be ignored?